Adding a rake task for compiling parsers.

  $ rake compile
Simplifying parsing of numbers.
Adding positive string test cases.
Improving string parsing and ouputting.
Refactoring streaming capabilities.
sigint and sigterm is now handled.
Adding ruby-2.1.{3,4,5} to the build spec.
Adding a bunch of tests for numbers.

Numbers in JSON can have a number of attributes.

* Negativity
* Having decimals
* Is of scientific notation
* Upper/lower case
* Negativity of exponent

Every combination of these attributes are now tested.
Renaming the application to Jiffy.
Bump version.