Add namespace helper.
Add cookieUtils to GOVUK.performance namespace

@robyoung
@gtrogers
Add lightGate to GOVUK.performance namespace

@gtrogers
@robyoung
Make patch.js comply to JSLint

@gtrogers
@robyoung
Make namespace.js comply to JSLint

@gtrogers
@robyoung
Make cookieUtil and lightGate comply to JSLint

@gtrogers
@robyoung
Add patch.js and namespace.js to lightGateTemplate

So that they are included in the combined javascript file.

@gtrogers
@robyoung
Release 0.2.0 of lightGate.js
Merge pull request #5 from alphagov/cut_0.2.0

Cut 0.2.0