Remove redundant null check in Pair.cs.

'is' will return false if it is null in this case (as it isn't a Pair in that case)
Fix ToString formatting for BezierCurve and Seg2F.

Seg2F just didn't need th extra params, while BezierCurve was missing three parameters.
Fix an exception message within a DomNodePropertyMatch constructor.

ArgumentNullExceptions are constructed with the parameter that is null being specified first as a string, then the message follows.
Merge pull request #2 from lioncash/minor-cleanup

Removed redundant null check in Pair.cs.
Fixed ToString() formatting for BezierCurve and Seg2F.
Fixed an exception message within a DomNodePropertyMatch constructor.
(Thanks to lioncash for finding and fixing these.)
Removed the Samples/LevelEditor directory and its ReadMe.txt file because it causes confusion and we no longer need to redirect users of older versions of ATF.
improved README.md

Added a list of components, to try to explain in this document what ATF
really is. Added links to the documentation to the Getting Started
section. Tried to address the good recommendation in issue #6.
Minor clarifications
Minor revisions such as updating Supported tools
Add trademark symbols
Correct ™ symbol
fixed some text in README.md

The smart-quotes (probably from MS Word) were not displaying correctly
on GitHub.
Slight refactor of 2D curve editing

Placed common code for drawing ticks into a private method. (from Alan)
Added additional Direct2D support

1. To render to a Direct2D Windows Imaging Component (WIC) render
target.
2. D2dGeometry
3. D2dGeometrySink
(from Tom)
Added .gitignore

I copied the recommended version from GitHub for Visual Studio (
https://github.com/github/gitignore/blob/master/VisualStudio.gitignore )
and added a couple of directories specific to Authoring Tools Framework.
Fixed NullReferenceException in Clamp<T> method when value parameter is
null. (from John)
another .gitignore change

We have legitimate 'x64' and 'bin' directories, so I don't want to
ignore those.
Merge branch 'svn_trunk'
Merge pull request #1 from SonyWWS/master

getting up to date