Automatically throttling requests based on Twitter's API rate limit

Picked from AvianFlu/ntwitter#77.

Signed-off-by: Félix Saparelli <me@passcod.name>
Add skip_status parameter to verifyCredentials

Picked from AvianFlu/ntwitter#77.

Signed-off-by: Félix Saparelli <me@passcod.name>
Avoid potential problems in case time is out of sync

Picked from AvianFlu/ntwitter#77.

Signed-off-by: Félix Saparelli <me@passcod.name>
Fix crash in case Twitter's response is empty

Picked from AvianFlu/ntwitter#77.

Signed-off-by: Félix Saparelli <me@passcod.name>
Update lib/twitter.js

Picked from AvianFlu/ntwitter#95.

Signed-off-by: Félix Saparelli <me@passcod.name>
Update to getMentions

Updated getMentions url to statuses/mentions_timeline.json based on
https://dev.twitter.com/docs/api/1.1/get/statuses/mentions_timeline

Picked from AvianFlu/ntwitter#79.

Signed-off-by: Félix Saparelli <me@passcod.name>
Add an example for delimited request parameter

Picked from AvianFlu/ntwitter#94.

Signed-off-by: Félix Saparelli <me@passcod.name>
Fix global leak in lib/twitter.js

Caused the framework to fail tests in some frameworks (I've tried in mocha).

Picked from AvianFlu/ntwitter#86.

Signed-off-by: Félix Saparelli <me@passcod.name>
Twitter API 1.1 Adaptation

- search_based modified for new API 1.1
- search method modified for new API 1.1 (Works with
  new search API, which has a different response structure)
- Add params for showStatus
- rateLimitStatus method modified for new API 1.1

Picked from AvianFlu/ntwitter#82.

Signed-off-by: Félix Saparelli <me@passcod.name>
Clean up and list PRs picked from