added support for library (.d.ts) files to be compiled with each .ts file
added support for watching the source files and auto-recompiling using a watch flag (-Dts.watch=true)
allow the 'tsc' executable to be used (as getting an odd rhino error currently in some TS compiles). Also allow a standard library to be specified in a separate file to the library .d.ts files (so that you can avoid the lib.d.ts when using the command line)
added better error output
if including a standard library definition, use it first before anything else (the TS compiler seems order dependent)
Merge pull request #1 from jstrachan/master

added support for library files (.d.ts) along with a watch option to recompile files when they change