Use plugin inheritance extractor from SpecialSource
Optimize reflection remapping

Combine reflection remap and inheritance extract into
a single pass, now in SpecialSource as "RemapperPreprocessor".
Reduces the times the class is read when all remapping
options are enabled from 3-pass to 2-pass.

About a 4% startup time performance increase observed
during testing with 31 plugins: https://gist.github.com/agaricusb/4728786
Enable plugin reflection remapping by default. Closes #13.

Adds support for plugins using (simple uses of) reflection.

UPGRADING NOTES:
- If you're upgrading from build 121+, which had reflection
remapping disabled by default, you can enable it by
setting 'reflect-remap-field: true' in bukkit.yml

- If your plugins suddenly break, this feature can be disabled
by setting 'reflect-remap-field: false' in bukkit.yml (and
please file issues for any problematic plugins).