Removed spammy debug message

Having a message logged every time the importer is triggered fills up
the log very quickly with garbage - removed.
Added cURL support

Appended XML and image loading functions to check for cURL and
prioritize it over allow_url_fopen routines if it is available.
Appending method to XML loading exception message

The log will now show which method failed when fetching XML.
Errors from category importing now logs to file

Added in required line for specifing which log
Moved feed loading checks into parent model class
Refactoring categories model

BraftonArticlesModelCategories now inherits from
BraftonArticlesModelParent for feed checking
Merge remote-tracking branch 'origin/curl-support' into article-update-support

Conflicts:
	Brafton Article Importer/admin/models/categories.php
Added support for article updates
Merged loading and updating routines

Removed existing implementation of article importing in favor of using
new version for consistency.
Fixed overactive cron
Added Apply Article Updates option

This is a new option under advanced settings. Defaults to On. Component
manifest is now at v0.7 and plugin manifest is now at v0.1.2.
Updated install script

The option row for article updates now properly gets inserted for new
installs.
Merge pull request #3 from ContentLEAD/dev

v0.7 - cURL and article updates support + various fixes