Exclude javax.* from release packages

[denley]

The processor requires some classes in javax.* to compile, which are included in the source. However, these classes don't need to be included in the release packages, and add unnecessary size.

[denley]

We should also exclude the com.sun.source.* package, which has been added to the classpath for #19

[kosiara]

Could you remove javax.annotation.* , specifically javax.annotation.Generated from the release of the aar? These shouldn't be included in the gradle dependency.