updated access control portion of style guide
Give ahot readme an extension

Otherwise mac filesystems get angry (not case sensitive by default)
Merge pull request #509 from scopatz/sgac

updated access control portion of style guide
Merge pull request #510 from crbates/ahot-ex

Give ahot readme an extension
Added MCNP interface for source sampling.
Changed tag names and mode indexing (MCNP idum numbers are indexed from 1).
Doc strings.
updated serp for v2 for res
updated detectors for serpent 2
Merge pull request #513 from scopatz/s2

Serpent 2 Updates
SG fixes
Made Fortran API non-specific for MCNP.
Starting documentation.
Adding doc file.
fix SG for underscores to close #490

also cleanup trailing whitespace
leading -> trailing underscore
fixes #476
Merge pull request #514 from crbates/sgus

fix SG for underscores to close #490
All code in documentation works.
Final Cleanup.