Julia 1.0+ compatibility

[hhaensel]

From version 1.0.0 on the compatibility functions start(), next() and done() for iterables were removed.
As this module only uses these functions with respect to strings, re-adding the functions is a three-liner. All tests pass under 1.0.0 and 1.3.0 (tested under Windows 10).

[coveralls]

Coverage decreased (-2.03%) to 97.462% when pulling 193286c on hhaensel:master into b96e0b0 on JuliaString:master.

[coveralls]

Coverage increased (+0.07%) to 99.561% when pulling b3a2ca2 on hhaensel:master into b96e0b0 on JuliaString:master.

[codecov-io]

Codecov Report

Merging #12 into master will decrease coverage by 0.54%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #12      +/-   ##
==========================================
- Coverage   99.48%   98.94%   -0.55%     
==========================================
  Files           1        1              
  Lines         196      190       -6     
==========================================
- Hits          195      188       -7     
- Misses          1        2       +1

Impacted Files	Coverage Δ
src/StringLiterals.jl	98.94% <100%> (-0.55%)	⬇️

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[hhaensel]

I learned a lot about Travis and the package manager (sorry for the many commits 😉 )
What I changed:

• created a Project.toml and made StringLaterals version 1.0.0-DEV
• adapted Travis to test with the inline=no option in order to get around the missing lines issue in Coverage.jl.

This version runs on all OSes on Julia versions from 0.6 to nightly.
I hope, this could be a version to be again registered with the Julia repositories.

[hhaensel]

I'll close this PR and open a new one with less commits 😉

[ScottPJones]

I'm sorry I missed this (been busy with personal issues lately, unfortunately).
You didn't need to close the PR and open a new one, just learn how to squash your commits with git in the future (and I hope to see more PRs from you, especially if you can move to the Strs set of packages 😄
I have merged the new PR, even though I hadn't intended on making any more changes to StringLiterals, as it as been completely superseded by StrLiterals (with StrFormat & StrEntities)