Merge pull request #2 from thaiphan/dev

Add a couple of tokeniser classes
Merge pull request #3 from thaiphan/dev

Re-organise project structure
Merge pull request #4 from thaiphan/dev

Add a couple of tests for simple tokeniser
Add sentence detector interface
Merge pull request #5 from smnadalin/dev

Add various interfaces
Add a couple of tests for Span class
Add chunker interface
Move ISentenceDetector to proper location
Merge branch 'dev' of https://github.com/thaiphan/mononlp into dev