Install git pre-commit hook which runs `pod spec lint' against modified specs in the master spec repo. Closes #74.

Remove references about installing from a podspec from `pod install', we only install from a Podfile. Closes #78.

Add a second commit to the mercurial repo so that the test selecting a revision actually makes sense.

Add an example which builds against a second target and references code. This is more a CI test than an example, though.

Copy headers first then build Pod. This ensures that Pod sources have access to the same header dir structure. Fixes #70.

Always copy headers to ./Pods instead of using the PRODUCT_NAME, which changes for each Pods target. Fixes #75.

The `source_files`, `resources`, and `clean_paths` attributes can take Rake::FileList instances too.