add function without cURL
Update version to 2.6.0-dev
Merge remote-tracking branch 'FabFab/develop' into feature/67-curl-alternative
Finish 2.5.0

Conflicts:
	CHANGELOG
	bower.json
	src/codebird.php
Merged 'develop'.
Trim trailing spaces
Use simpler PHPDoc header for codebird.php
Merged 'develop'.
Auto-detect curl availability, refactor no-cURL methods
Use default timeout
Don't hard-code non-curl SSL cert peer host name
non-curl: Use HTTP/1.1, respect timeout
Add Accept: */* header
Detect if oauth_token is not set
Empty params may be JSON-encoded as [] or {}
Drop empty Expect: header in non-cURL
Set application/x-www-form-urlencoded header
Use camelCase for method names
Finish 67-curl-alternative, fix #67
add composer/installers to allow the flexibility to change the path where this package is installed