Merge tag 'v1.7' into develop

Added:
* FilesExt.append()
Rolling version to 1.8-SNAPSHOT
README cleanup
Added:
* JUnitFiles(File) constructor
Added CommonDateFormats.parse...() methods
Added StringBuilderExt
Rolling version to 1.8
Updated release notes
Merge branch 'release-1.8'
* Added:
    * JUnitFiles(File) constructor
    * CommonDateFormats.parse...() methods
    * StringBuilderExt