Prepare for version 1.7.2
1.7.2
validateIndentation: handle breakless case stmts

Fixes #693
Parsing: Use the harmony parser via the esnext flag in the config

Closes gh-692
Fixes #691
Prepare for version 1.7.3
1.7.3
Readme: remove duplicative example for requireCurlyBraces
New rule: requireSpaceBeforeKeywords
New rule: disallowSpaceBeforeKeywords

Closes gh-699
Correct error message for "requireSpaceAfterKeywords" rule
StringChecker: Comment typo

Closes gh-702
Parsing: Follow up test for multiple checks using the esnext config flag

Closes gh-694
requireSpaceAfterLineComment: add "except" option

* According to #592 and #593 it was decided to make "except" option for
  this rule to pass list of allowed characters

* Treat tabs as spaces in comments

Closes #696
Fixes #592
Docs: Clarify "config" option

Closes #675