Change http.read_timeout value to 2 mins

http.read_timeout() takes seconds as an attribute.
Extract http timeout to options hash
Add options description to README
Merge pull request #22 from liquidm/change_http_read_timeout

Change http.read_timeout value to 2 mins
Bump version to 0.1.8
better format for travis
add js post aggregator support
version bump
Merge branch 'master' into js_post_aggregator

Conflicts:
	ruby-druid.gemspec
add chaining having support
improve having chaining
use serializable module for js post agg
remove unset method hack from having
Merge pull request #24 from liquidm/js_post_aggregator

add javascript post aggregator
semicolon for js example in readme
add reachability helper
Merge remote-tracking branch 'liquidm/master'

Conflicts:
	.rspec
	.travis.yml
	lib/druid/client.rb
	spec/lib/query_spec.rb