"Signed" the contributors.txt file.
Merge pull request #98 from murrayju/outOfMemoryChecks

null checks for ?alloc calls; fix for #96
Include exception information for error 7 (reported for most IOException cases)
C# port: Fix CommonTreeNodeStream implementation of IPositionTrackingStream
CSharp targets: Updated assembly info for build 3.5.0.2
Merge pull request #1 from antlr/master

Include recent changes