more passing specs
Fixed #577 -- corrected a parsing error with symbol keys and hashrockets
Implemented Hash#values_at
Don't dup and freeze already frozen kesy
Added Hash#value?
added Hash#to_a
Added Hash#invert
Added Hash#has_value?
added Symbol#{upcase,downcase}
fixed a proc spec
Added a Source Map to the docs.
Untagging passing specs
Merge pull request #578 from jstepien/untagging

Untagging passing specs
Untag some passing specs

* Array#map
* Array#+
Implement Array#to_a
Merge pull request #580 from kachick/untag-passing_specs

Untag some passing specs in Array
Merge pull request #581 from kachick/implement-array-to_a

Implement Array#to_a
Fix Array#delete
Replace Random#srand with Kernel.srand

The actual sranding takes place in the W_RandomObject.srand method.
Add PID to random seed generation