Begin to implement cons
Merge pull request #43 from patrickgombert/cons

Begin to implement cons
added protocols for persistent vector
added nth
started persistent vector
added assoc-n to persistent vector
added assoc to perisistent vector
Reimplement Ratio in Java
Merge pull request #45 from patrickgombert/jvm-ratio

Reimplement Ratio in Java
renamed Indexed to IIndexed
Merge pull request #32 from kevinbuch/persistent-vector

Persistent vector
Introduce reduce for generic seqs
Merge pull request #46 from patrickgombert/reduce

Introduce reduce for generic seqs
Begin to implement addition and division number ops
Allow generic numbers to be used in addition
Add tests for division and allow generic numbers to be divided
Merge pull request #48 from patrickgombert/number-ops

Number ops