fix nil check
Add Element#to_n to return native jquery instance

Currently returns self, but when Element is a wrapped instance, this
will instead return that wrapped value.
Add json as dependency of http.rb (fixes failing specs)
Merge branch 'fix_nil_check_in_http' of git://github.com/svoboda-jan/opal-jquery into svoboda-jan-fix_nil_check_in_http
Fixes for new class bridges.

A change to the way opal handled class bridging broke jquery support.
This commit alters the way classes are now bridged for jquery instances.
v0.0.12
Stop bridging Event as native, and treat as a wrapper
Revert: previous commit
Use Element#expose in preference to method_missing
v0.0.13
Use Enumerable for #map and #to_a in Element
untaint path
Add Event#key_code

fixes opal/opal#365
Group Event methods by concern
Merge pull request #25 from rubys/safe_path

untaint path
Raise error if jquery/zepto cannot be found
Add :dist rake task for building and minifying builds
Let Kernel#alert return nil
Add native mapping for Element#empty
Merge pull request #29 from andriusch/master

Add native mapping for Element#empty