Added method Twitter::SearchResults#next_results?

Returns true if there is a next page for a Twitter SearchResult.
Returns false otherwise

Aliased to next_page? for backward compatibility with v1 API
Added Twitter::SearchResults#next_results

Returns a hash of query parameters for accessing the next page of search results
Can be merged into the previous search options for easy access
convert nested classes in Twitter::Base#attrs
Prepare for version 4.6.1 release
Add specs for Twitter::Tweet#filter_level
Only send if method takes no arguments (even default arguments)
Update mailing list URL [ci skip]
Merge pull request #366 from KentonWhite/next_results_1

Added method Twitter::SearchResults#next_results?
Add support for new favorite_count attribute

https://twitter.com/twitterapi/status/314073647704862721
Revert "Make #attrs call methods if they exist"

This reverts commit ff4f2daccd1acdfddcea7139d4dd6490b55129db.
Prepare for version 4.6.2 release
Implement oauth2/invalidate_token
Use ssl if endpoint is HTTPS
Merge pull request #372 from terenceponce/invalidate_token

Implement oauth2/invalidate_token
Adding Bearer Token support

- Added :bearer_token to the list of configuration parameters
- The default value of the bearer_token is read from the environment
  variable
- Requests send the "Bearer AAA..." type authentication header if a
  bearer token exists
- Added tests to verify that bearer token implementation works as
  intended
Adding oath2/token method

- I had to replicate the functionality of the request method to
  accomodate for the abnormal way we have to make the request
- Configurable can supply the base64 encoded bearer token credential
Moving methods around and added documentation.
Adding tests for the token method
Unifying the request method of Twitter::Client

- The request method is using a helper method request_setup that returns
  a Proc which sets up the correct headers for the current request.
- Each type of different authentication header is being returned by a
  separate private method and they all have tests.
Adding bearer_token as an alias to token