Renamed uri() to path()
Renamed all occurrences of uri() into path()
Changed explode_uri() into explode_path()
Changed CURRENT_URI into CURRENT_PATH
Changed BASE_URI into BASE_PATH
Changed URI_PUBLIC into PATH_PUBLIC
Changed THEMES_URI into THEMES_PATH
Changed PLUGINS_URI into PLUGINS_PATH
Changed ICONS_URI into ICONS_PATH
Removed other references to URI
Merge pull request #529 from NicNLD/page_path

Renames Page's uri() method into path()
Updated readme to reflect new dependency on PHP 5.3+
Fixes registerMethod to pass test
Add CONTRIBUTING.md file
Rename readme to uppercase
Merge branch 'develop' into issue-539