Added license header to AssemblyInfo.cs
Renamed MimeKit_MonoDevelop.sln
Fixed the 'atleast' calculation in MimeParser.ScanContent()
Fixed the 'atleast' calculation in MimeParser.ConstructMessagePart()
Bumped version to 0.10.1.0
Replaced FormatOptions.MaxPreEncodedLength with a much better approach

This new approach still isn't perfect, however, because it allows the
word to reach or slightly exceed the max line length before breaking
apart long words.
Implemented a much more accurate word-breaking algorithm
Allow the use of HeaderId instead of string fields in the Header* APIs
Updated S/MIME unit tests for verifying signatures
Don't verify signatures in SecureMimeContext.Verify(), let our caller do that.

By having our caller iterate over each individual signer, they can get more
valuable information than just "all verified" vs "something failed".
Fixed parsing/serializing of multipart preambles to get Outlook S/MIME messages to verify correctly
code cleanup
"soptimization" to use for-loops instead of foreach loops
Drop IClonable for IMimeEncoder/Decoder in favor of a more useful Clone() API.
Minor fixups to the crypto logic.
Bumped version to 0.11.0.0
Refactored the Cryptography APIs to better allow for pluggable backends.
Minor fixes to the previous commit
More improvements to the cryptography API.
Minor tweaks and cleanup to the previous commit