v0.7.0

In this release...

• Upgraded the library to comply with SemVer 2.0.0
• Replaced regular expressions with a parser
• Implemented SemVer Expressions (#1)
• Documented the source code with Javadoc (#2)
• Published the library to Maven Central (#4)
• Performed refactoring and minor code improvements

Including changes from previous unpublished versions

• Implemented basic functionality in compliance with SemVer 2.0.0-rc.2
• Created Version.Builder class
• Created Version.BUILD_AWARE_ORDER comparator