Added GetSymbol function to the language service
Added GetSymbol function to the language service

Refactored naming of untyped parse info to match new naming in
FSharp.Compiler.Service.  Also exposed underlying CheckFileResult

cloudRoutine/FsAutoComplete,vasily-kirichenko/FsAutoComplete,rneatherway/FsAutoComplete,kjnilsson/FSharp.AutoComplete,cloudRoutine/FsAutoComplete