MDAnalysis / GridDataFormats

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Updated parsing for DX files (#52)

* Fixed openDX parser so it can read all floats;
   previously, the parser would choke on lines line

      0.0   -1e-6    0.0

   by splitting it into tokens '0.0', '-1', 'e-6', '0.0'.
* Modified the float regex to fix this but this meant that ints also got read as floats
* Updated the parts of the code that expected ints to accomodate this
* Accelerated reading of DX files (fix #2)
   Skipping the parser for reading in data
* Modified `test.dx` to contain data in scientific notation.
* Added a non-trivial origin to test.dx.
* tests changes in commit 630f99.  Versions previous to this will not
  be able to read the file.
* Including @tluchko in AUTHORS and updating the CHANGELOG
* Updated OpenDX test script to go with new test file
* Added comments for REAL regular expression

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