Merge pull request #15 from phptek/update-docs

MINOR: Improved docs
Update Readme doc for MetaDescription example
NEW 'Import files & images to assets'
Update of field description
Docblock and coding styleguide fixes
Code cleanup and refactoring

No new functionality
NEW: Save imported files with the original path

This change also bypass the usage of the Upload class to simplify the logic
BUG inferred urls dont return a mime-type
BUG Bad duplicate page check causes infinity recursion in hierarchy
NEW 'Import files & images to assets'
- Cleaned-up the warnings and notices functionality into own method
- Added logging for failed URL rewrites to analyse what's failing
- Added some URL cleanup routines to the URL Rewrite task which improve the hit-rate as per data from the log
ENHANCEMENT: In-page asset URL/Path references are re-written correctly in StaticSiteRewriteLinksTask
ENHANCEMENT: Added basic logging for all URLs that couldn't be processed correctly
BUGFIX: Fixed regression on StaticSiteContentSource from ff6326213988