Add Guava dependency
Add inheritance map writing

New --write-inheritance/-H command-line option, iterates all classes
in mapping and writes inheritance (interfaces and superclasses) to file.

Example usage, generating inheritance map from MCPC+:

java -cp target/SpecialSource-1.3-SNAPSHOT-shaded.jar:mcpc-plus-1.4.7-R0.2-SNAPSHOT.jar net.md_5.specialsource.SpecialSource --srg-in ~/minecraft/1.4.x/jars/1.4.7/cb2obf.csrg --live --write-inheritance /tmp/h
Sort inheritance map written to file
Add option to generate unrenamed symbols in mapping output
Reduce unnecessary output in generated inheritance map

Only includes mapped classes in the parents, and only includes entries
for classes which have relevant parents (extends/implements classes).
Shrinks inheritance map on MCPC+ build 73 by 279 lines.
Add missing copyrights
Add inheritance map file reading
Add inheritance map file reading

The inheritance map, as generated with --write-inheritance/-H, can now
be read using --read-inheritance/-H. It will be remapped through the
currently loaded inverse mapping before supplying the inheritance provider.

Example usage:

java -cp target/SpecialSource-1.3-SNAPSHOT-shaded.jar net.md_5.specialsource.SpecialSource --shade-relocation net.minecraft.server=net.minecraft.server.v1_4_R1 --shade-relocation org.bouncycastle=net.minecraft.v1_4_R1.org.bouncycastle --srg-in ../jars/1.4.7/cb2obf.csrg --in-jar ../IncompatiblePlugin/target/bukkit-sample-plugin-0.5.jar  --out-jar /tmp/sp/out.jar  -h /tmp/h

where the inheritance map was previously generated using:

java -cp target/SpecialSource-1.3-SNAPSHOT-shaded.jar:mcpc-plus-1.4.7-R0.2-SNAPSHOT.jar net.md_5.specialsource.SpecialSource --srg-in ~/minecraft/1.4.x/jars/1.4.7/cb2obf.csrg --live --write-inheritance /tmp/h