Should probably set referrer when following a location.
Adds cURL based replacement for file_get_contents.

1) This function will work in hosted environments where fopen protocol wrappers are disabled for security (irritatingly common)
2) It obeys our global curl settings, so for example sends a nice browser id string, and in future will obey global curl settings such as proxy (refs: #202)
Fixing faulty logic, oops!
Like uses web services call
Deprecating webmention getPageContent in favour of centralised web services calls
Merge pull request #241 from mapkyca/replacing-filegetcontents

Replacing filegetcontents