Modified the functions in the Dict module to use the 'dict' type abbreviation.
Added CompiledNameAttribute to active patterns.
Merge branch 'master' of github.com:jack-pappas/ExtCore
Moved the substring type and module into a new file, Substring.fs.
Implemented substring-based versions of some functions which were previously implemented in the String module; then, the String functions were modified to use the substring-based version to avoid code duplication.
Stubbed out an ExtCore.IO.File module.
Added some TODO items.