Add scala compiler libraries to scala facets optimistically

Fix Find libraries + add logic to find Libraries in ProjectInfo so that it can be used in scala Facet

Testing Done:
yes. Manually imported the project.

Reviewed at https://rbcommons.com/s/twitter/r/1059/
Better Scala Compiler Library resolving + fix for common source root of several targets

Testing Done:
manually.

Reviewed at https://rbcommons.com/s/twitter/r/1060/
log not found libs only if we tried to resolve them
Move plugin generated files out of .pants.d/
Better handling of common source roots for modules

Testing Done:
manually

Reviewed at https://rbcommons.com/s/twitter/r/1103/
Fizes to avoid circular dependencies

Fix cyclic dependencies

Testing Done:
yes manually.

Log debug statements while importing project sources:

Found cyclic dependency between .pants.d_gen_scrooge_scrooge_scala-finagle_thumbingbird-thrift.image-fetcher.src.main.thrift.thrift-scala and .pants.d_gen_scrooge_scrooge_scala-finagle_thumbingbird-thrift.only.src.main.thrift.thrift-scala

Found cyclic dependency between .pants.d_gen_scrooge_scrooge_scala-finagle_thumbingbird-thrift.thumbnail.src.main.thrift.thrift-scala and .pants.d_gen_scrooge_scrooge_scala-finagle_thumbingbird-thrift.only.src.main.thrift.thrift-scala

Reviewed at https://rbcommons.com/s/twitter/r/1111/
inc version
Add Docs Imgs

Fix Doc indentation

Testing Done:
https://github.com/pantsbuild/intellij-pants-plugin/tree/add_readme Looks good

Reviewed at https://rbcommons.com/s/twitter/r/1115/