Upgrade to guava 15.
Tokenization is configurable.

Also:
* Reduce dependency on Guava.
* Remove unused code.
Handle escape characters in logic tokenization.
Change visibility.
Remove unused classes.
Change visibility on LogicExpression.
Split parser code out of RegEx and LogicEx.
Merge pull request #12 from knowitall/tokenize

Configurable and modular parsing code
Prepare for release of 1.1.0.
Prepare for development of 1.1.1-SNAPSHOT.
Use possessive quantifiers in string identification regexes.
Add compiler version.
Prepare for release of 1.1.1.
Prepare for development of 1.1.2-SNAPSHOT.
Switch from maven to sbt.
Add test scope to scala library.
Add travis.yml for sbt.
Update README and add test cases for the README examples.
Merge pull request #13 from knowitall/readme

Update README and add test cases for the README examples.