Added AppVeyor CI script

Fixes #48
Added build status badge to README.md
Move developer guide to wiki

Updated links in README.md and CONTRIBUTING.md to point to wiki.

Deleted docs/Developer.md as the content has been merged to the
wiki.

Also, changed some markdown links to end-note style for better
word wrapping.
Moved some variable declarations that were defined in an outer scope

Removed whitespace
Merge branch 'master' of https://github.com/n1ghtmare/corefx
Remove use of non ASCII characters in literals.

We would prefer that we don't use non ASCII characters in either string
or character literals.  In theory, every editor and tool would ensure
that these characters are not translated to some random encoding or
otherwise become corrupted.  In practice, we're just going to err on the
side of caution.
Replace non ASCII characters in comments with ASCII equivalents.
Move contributing link to wiki.

We're adding additional information on contributing to the wiki so
link there from CONTRIBUTING.md. The file is retained so that GitHub
will still link to it for all incoming pull requests.
Merge branch 'remove-unicode-characters'