Merge pull request #19 from gaurav/feature/filetypeextractor

Feature/filetypeextractor
Merge branch 'commons' of github.com:gaurav/extraction-framework into commons
Merge pull request #28 from gaurav/feature/all-commons-extractors

Feature/all commons extractors
Make the directory/file vals lazy so that they don't throw up errors in distributed framework

These vals are overriden in DistConfig.ExtractionConfig, needs to be lazy.
Merge pull request #252 from nilesh-c/config-lazy-dirs

Make the directory/file vals lazy so that they don't throw up errors in distributed framework
Add comments for lazy dir/file-based vals
Merge pull request #253 from nilesh-c/config-lazyval-comments

Add comments for lazy dir/file-based vals
Merge branch 'master' into commons
Merge branch 'commons' of github.com:gaurav/extraction-framework into commons

Conflicts:
	dump/extraction.default.properties
Merge branch 'commons' into feature/all-commons-extractors