Fixed a bug in the processing of HTTP response headers

Response header values with leading or trailing whitespace were parsed incorrectly, even though the HTTP standard specifies that such whitespace should be ignored (http://www.ietf.org/rfc/rfc2616.txt - Section 4.2).
This change trims said whitespace from all HTTP reponse header values.
[cpp] Do not eliminate 'never' accessors unless they are also external
do not add non-core-type abstracts to swc dependencies (see #2590)
fix Lambda.find documentation
allow having multiple types in the Array module
use proper class for array iterator on C#
also use iterator class on java
temp fix for doc_gen issue with UInt
(As3) make private @:op functions public in output (closes #2596)
[std] Rewrite Int64 as an abstract
[tests] Rewrite Int64 unit tests
[std] Remove correct @:commutative in Int32

Also change public to private on ops
Add some more inlines
[cs] Implement abstract Int64
[java] Implement abstract Int64