Custom Parser Support & Jar Output

- Added a small Gradle script to output .jar files upon build.
- Wrote abstract Parser to extend and create custom parsers from. Now
you can use any type of content!
- Fixed a small IDE configuration issue
Base Parser Mods, Builder, & Javadoc

- Modified the abstract Parser class to include safe logging
- Base Parser no longer requires PkRSS instance
- Deleted old RSSParser
- Renamed Parser instance in PkRSS.java
- Created Builder class for making custom instances
- Documented more code <3
- Prepared version for new release