Check for wp_is_mobile

Recommend using jetpack_is_mobile, as per
https://github.com/Automattic/vip-scanner/issues/21
Suppress errors for transients that are too big

We're using transients to cache the review results, but if there are too many errors, the transient might be too big to fit into a 1MB cache bucket. It won't get added to the cache, which isn't the end of the world — it will just be slower.

We should still suppress the error telling us that the object is too big for the cache though.
Merge pull request #50 from joshbetz/master

Suppress errors for transients that are too big
Flag uses of the user meta functions in VIP themes

On WP.com, the users tables are enormous, so user meta queries are
unfeasible.

Flag uses of the user meta functions as a Blocker

Fixes #51
Fix level of user meta flags

Was some copy/pasta…should all be Blockers
Merge pull request #55 from Mobius5150/master

Integrate PHP Code Sniffer with VIP Scanner using the WordPress Coding Standards
Flag libxml_set_external_entity_loader as blocker

Not cool, friends.
Whitespace cleanup
Merge #38 from @natebot

Adds wp_is_mobile() to restricted commands
Fix strict error

PHP thought `vip_scanner_form` was a PHP4 constructor. Changing the
name to form allows us to remove the PHP5 constructor (because we're
not using it anyway).
Forms: Allow devs to disable them

As a VIP dev, I don't need to fill out the form when I send feedback.
Replace call to tc_filename() with $this->get_filename()

`tc_filename` is not defined anywhere and causes a fatal error
Moves setup code from VIP_Scanner_UI::__construct() into the init action

To allow hooking into the actions / filters called here, which is
impossible unless the hooking code was included before VIP Scanner
(which is up to WP’s plugin loading order).

Fixes #70
Fix typo in $exclude_file_regex

Was causing the regex to not be properly imploded and passed to ClamAV
Add various multisite functions to restricted commands check

Blacklists a few MU functions that sites in multi-tenant environment
shouldn’t be calling

Fixes #34
Flag uses of the uncached wp_get_post_categories()

Is just a wrapper around wp_get_object_terms()

Fixes #42
Flag the uncached wp_get_post_tags() function
Integrating the VIP Theme Review with the main plugin.

In response to #59. Rolled the VIP Theme Review into the main plugin and
got rid of the standalone plugin for the VIP rules.

Placed the code for creating the fancy form on the VIP Theme Review page
in vip-scanner/config-vip-scanner-wpcom-form.php.

Closes #59