Merge pull request #10 from cameronfletcher/release

v0.3.3
Minor amandments to git ignore file.
Attempt to fix issue with author names being combined.
Added basic PCL support.
Updated nuspec with PCL details. Minor tidy up.
Incrementing version.
Updated nuspec with PCL version.
Updated Resharper suppressions
Added git attributes file
Update README.md
Added additional overloads to PCL version.
Updated Resharper suppressions.
Fixed code analysis errors.
Updated guard clause for PCL to avoid boxing of nullable types.
Updated expression evaluation of nullable types to use HasValue property.
Updated release notes.
#2 Updated GuardianExtensions.
Incrementing version number.
#8 Added nuspec for Guardian Extensions
#8 Added nuspec for Guardian Extensions