Add clang-format; travis CI; LICENCE

.clang-format

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+BasedOnStyle: Google
+AccessModifierOffset: -1
+AlignEscapedNewlinesLeft: true
+AlignTrailingComments: true
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowShortFunctionsOnASingleLine: true
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+#AlwaysBreakBeforeMultilineStrings: true
+AlwaysBreakTemplateDeclarations: true
+BinPackParameters: true
+BreakBeforeBinaryOperators: false
+BreakBeforeBraces: Linux
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializersBeforeComma: false
+ColumnLimit: 0
+CommentPragmas:  '^ IWYU pragma:'
+ConstructorInitializerAllOnOneLineOrOnePerLine: true
+ConstructorInitializerIndentWidth: 2
+ContinuationIndentWidth: 2
+Cpp11BracedListStyle: false
+DerivePointerBinding: false
+ExperimentalAutoDetectBinPacking: false
+IndentCaseLabels: true
+IndentFunctionDeclarationAfterType: true
+IndentWidth:     2
+# It is broken on windows. Breaks all #include "header.h"
+Language:        Cpp
+MaxEmptyLinesToKeep: 1
+KeepEmptyLinesAtTheStartOfBlocks: true
+NamespaceIndentation: None
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: false
+PenaltyBreakBeforeFirstCallParameter: 1
+PenaltyBreakComment: 300
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakString: 1000
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 200
+SortIncludes: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeParens: ControlStatements
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles:  false
+SpacesInContainerLiterals: true
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+Standard:        Cpp11
+TabWidth:        2
+UseTab:          Never

.travis.yml

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+sudo: false
+matrix:
+  fast_finish: true
+   # Note: Workaround travis-ci/travis-ci#4681
+   # Exclude default job which lacks our included environment variables.
+  exclude:
+    - os: linux
+    - env:
+  include:
+    - os: linux
+      env: TOOL=clang-format
+      addons:
+        apt:
+          sources: *sources
+          packages: ['clang-format-3.9']
+      compiler: clang
+script: |
+    if [[ $TOOL == "clang-format" ]]; then
+      if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then
+        BASE_COMMIT=$(git rev-parse $TRAVIS_BRANCH)
+        echo "Running clang-format-3.9 against branch $TRAVIS_BRANCH, with hash $BASE_COMMIT"
+        COMMIT_FILES=$(git diff --name-only $BASE_COMMIT | grep -ivE 'LinkDef|Utilities/PCG/')
+        RESULT_OUTPUT="$(git-clang-format-3.9 --commit $BASE_COMMIT --diff --binary `which clang-format-3.9` $COMMIT_FILES)"
+
+        for x in $COMMIT_FILES; do
+          case $x in
+            *.h|*.cxx)
+              # We remove the header from the diff as it contains +++ then
+              # we only select the added lines to check for the long ones.
+              # We do not need to check for the lines which have been removed
+              # and we do not want to check for the lines which were not changed
+              # to avoid extra work.
+              # 120 characters are allowed, meaning the error should start with 122,
+              # to allow for the starting + at the end of the line.
+              git diff $x | tail -n +5 | grep -e '^+' | grep '.\{122,\}' && { echo "Line longer than 120 chars in $x." && exit 1; } || true ;;
+            *.hxx|*.cc|*.hpp) echo "$x uses non-allowed extension." && exit 1 ;;
+            *) ;;
+          esac
+        done
+
+        if [ "$RESULT_OUTPUT" == "no modified files to format" ] \
+          || [ "$RESULT_OUTPUT" == "clang-format did not modify any files" ] ; then
+          echo "clang-format passed."
+          exit 0
+        else
+          echo "clang-format failed."
+          echo "To reproduce it locally please run"
+          echo -e "\tgit checkout $TRAVIS_BRANCH"
+          echo -e "\tgit-clang-format --commit $BASE_COMMIT --diff --binary $(which clang-format)"
+          echo "$RESULT_OUTPUT"
+          exit 1
+        fi
+      fi
+    fi