BUGFIX:
- Fixes issue during import where module attempts to import assets with no file-extension causing an SS error and a failed import.
- Fixes and improves a hitherto unused method on `StaticSiteUtils`
- Refactored image-import filenames so they match their origin filenames. Allows the link rewrite task to correctly identify them
- Removed call to parse_url() which can cause import to die by returning false
- Added better filename integrity checks and a better failover
- Added more comments to BuildTask and made string comparison checks case-sensitive in the printMessage() method
- Increased max_execution_time() again
- Fixes to ext_to_mime_compare() ensures an array key is only checked-for, if it exists
- Fixes to buildFileProperties() ensures correct URL value was being passed
- Ensured that "bad" and unconvertable asset-URLs are only thrown away if they need to be
- Used setXXX() methods when saving Files
Merge branch 'master-import-and-buildtask-fixes'