Add fixed point type (#322)

* WIP: Adding FixedType to Firrtl proper

Got simple example running through width inference
Checks should be ok
Need to look into FixedLiteral more

* Added simple test for fixed types

* Added asFixedPoint to primops

* Added tail case for FixedType

* Added ConvertFixedToSInt.scala

Added pass to MiddleToLowerFirrtl transform

* Replace AsFixedType with AsSInt in fixed removal

* Bugfix: constant from asFixed not deleted

* Added unit test for bulk connect

* Fixed partial connect bug #241

* Fixed missing case for FixedPoint in legalizeConnect

* Add FixedMathSpec that demonstrates some problems with FixedPointMath

* Fixed test and ConvertToSInt to pass.

Negative binary points not easily supported, needs much more time to
implement.

* Refactored checking neg widths

Make checking for negative binary points easier

* Added tests for inferring many FixedType ops

shl, shr, cat, bits, head, tail, setbp, shiftbp

* Handle bpshl, bpshr, bpset in ConvertFixedToSInt

Changed name from shiftbp -> bpshl, bpshr
Change name from setbp -> bpset
Added more tests

* Added set binary point test that fails

* Added simple test for zero binary point

* gitignore fixes for antlr intermediate dir and intellij dir

* removed unused imports
retool the fixed point with zero binary point test

* simplified example of inability to set binary point to zero

* Temporary fix for zero-width binary point

This fix allows for all widths to be zero, but since this is a feature I
am working on next, I'm not going to bother with a more stringent check.

* change version for dsp tools

* Removed extra temporary file

* Fixed merge bug

* Fixed another merge bug

* Removed commented out/unrelated files

* Removed snake case

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