Try to avoid page crawl errors by setting page_url when is_single()

http://adcodemanager.wordpress.com/2013/04/10/hi-all-on-a-dotcom-site-th
at-uses/
Merge pull request #68 from nickdaugherty/master

Add is_single as a whitelisted conditional
Adding a todo for #69
Merge branch 'master' of github.com:Automattic/Ad-Code-Manager
Revert "Try to avoid page crawl errors by setting page_url when is_single()". Changing approach.

This reverts commit 5026edca02bf8e9e824f05da844150e989f5a648.
Don't show ads on preview
Merge branch 'master' of git://github.com/paulgibbs/Ad-Code-Manager into paulgibbs-master
Adding a configuration filter acm_disable_ad_rendering
Adding more default ad tags for DFP Async
Update readme with props for #66
Updating in-screen help:
* Removing installation tab (after all, user already installed the plugin)
* Adding Configuration Filters tab
Removing OpenX not implemented provider. Ain't nobody got time for that
Coding standards
Updating POT
Merge branch 'master' of github.com:Automattic/Ad-Code-Manager
Updating Tested Up To
Merge pull request #74 from nickdaugherty/master

Prefix tag ids in DoubleClick Async provider. Props @nickdaugherty
Tag v0.4.1
Bump working version
Merge remote-tracking branch 'upstream/master'