Sorted:

Express, EJS, challenge with testing for undefined-Collection of common programming errors

Devise undefined method `email'-Collection of common programming errors

Can tan 90 degrees be calculated in a computer program?-Collection of common programming errors

devise undefined method `users_url' for RegistrationsController-Collection of common programming errors

TFS2010 with VS2012 workflow build process templates-Collection of common programming errors

BASH getopt command returns its own parameters instead of command line parameters-Collection of common programming errors

Can't access image_tag from helper module-Collection of common programming errors

the correct actionscript to find if object already exists-Collection of common programming errors

What is the domain and range of this: f(x)=sec((pie*x)/4)?-Collection of common programming errors

How do I add options to a built in function, which only apply to a certain class of argument?-Collection of common programming errors