Merge pull request #38 from mpickering/master

Fix 2 compilation errors
Removed mathmode parameter from escapeLaTeX.

All our text environments are math mode.
Use math mode by default.
TeXMath writer:  more pleasing spacing around Bin and Rel symbols.
More improvements to LaTeX spacing.

Ensure no space before _, ^, or \limits.
Test suite improvements.

* Deleted some mml,omml,tex files that had no counterparts in src/.
  (mrootE2, mtable1, noChildPresentation).  I assume these were here
  inadertently.  They were empty.

* Writer tests now start from .native files.  Previously we started
  from .tex and .mml files, which muddies things because the reader
  gets involved.

* Read files strictly in test suite to avoid "too many open files."
Changed the type of ESpace to ESpace Double
TeX Renderer: Fixed typo