xml2 1.0.0

• xml_integer() and xml_double() functions to make it easy to extract
  integer and double text from nodes (@jimhester, #97, #99).
• xml2 now supports modification and creation of XML nodes. New functions
  xml_new_document(), xml_new_child(), xml_new_sibling(),
  xml_set_namespace(), , xml_remove(), xml_replace(), xml_root()
  and replacement methods for xml_name(), xml_attr(), xml_attrs() and
  xml_text() (@jimhester, #9 #76)
• xml_ns() now keeps namespace prefixes that point to the same URI
  (@jimhester, #35, #95).
• read_xml() and read_html() methods added for httr::response() objects.
  (@jimhester, #63, #93)
• xml_child() function to make selecting children a little easier
  (@jimhester, #23, #94)
• xml_find_one() has been deprecated in favor of xml_find_first()
  (@jimhester, #58, #92)
• xml_read() functions now default to passing the document's namespace
  object. Namespace definitions can now be removed as well as added and
  xml_ns_strip() added to remove all default namespaces from a document.
  (@jimhester, #28, #89)
• xml_read() gains a options argument to control all available parsing
  options, including HUGE to turn off limits for parsing very large
  documents and now drops blank text nodes by default, mimicking default
  behavior of XML package. (@jimhester, #49, #62, #85, #88)
• xml_write() expands the path on filenames, so directories can be specified
  with '~/' (@jimhester, #86, #80)
• xml_find_one() now returns a 'xml_missing' node object if there are 0
  matches (@jimhester, #55, #53, tidyverse/rvest#82).
• xml_find_num(), xml_find_chr(), xml_find_lgl() functions added to
  return numeric, character and logical results from XPath expressions. (@jimhester, #55)
• xml_name() and xml_text() always correctly encode returned value as
  UTF-8 (#54).