Merge pull request #79 from sneves/master

Refactor MSVC project files
ship sodium.props
Make MSVC parser not panic when it parses a long literal.
Just use the scientific notation instead.
Found by @sneves, thanks!
Move back to Xcode.app
Export scalarmult_curve25519 constants
Add an empty line. Yeah, that's a fantastic commit.
Be consistent, keep macros and related functions next to each other.
Bump library minor
Check for arc4random()
Use arc4random() in tests if available.