add license information to gemspec

this way it can be used with rubygems.org API
Move asset Gzip compression to Sprockets to fix Rails 4 regression
Merge pull request #414 from ai/gzip

Move asset Gzip compression to Sprockets to fix Rails 4 regression
Zip bundled assets
Merge pull request #408 from jordimassaguerpla/master

add license information to the gemspec
Add gzip change to changelog
Merge branch 'master' of https://github.com/sstephenson/sprockets
Sprockets 2.9.0
Loosen coffee-script source dev dep
Make the DirectiveProcessor encoding aware

In Ruby 1.9, the directive_processor.rb source file defaults to US-ASCII
as it doesn't contain a magic comment, meaning the String initialised in
@result gets a US-ASCII encoding.

This means that when content is concatenated onto @result (e.g. in
process_source), Ruby will maintain the US-ASCII encoding, provided the
content being concatenated contains no non-ascii chars.

The changes in this commit force the encoding of the resulting string to
be that of the body, because conceptually that is the string we are
"concatenating" with.
Use explict, secure url

Using :rubygems is deprecated
Merge pull request #423 from strzalek/patch-1

Use explict, secure url
Support uglifier 2.x option style
Note uglifier 2.x support
Sprockets 2.9.1
Build on Ruby 2.0
sass now prefers partials over fullnames

nex3/sass@6cc01962be2203b829616de4b33514ad5c7188d2
Fix brittle size assertion
Expect generic execjs error
Update assertion for CoffeeScript output change