language interpreters and shebang lines

Add an interpreter array to each language, and match interpreters found
in the shebang lines of scripts to this array to identify the language
of scripts.

With suggestions from tnm. https://github.com/github/linguist/pull/687
adding interpreter arrays to some languages
unit test for find_by_shebang
Add .lmi to Python extensions

The OpenLMI project provides a scripting environment based on
Python (wrapping the Python interpreter with the 'lmishell'
command). Python scripts intended to be executed via lmishell are
conventionally given the suffix .lmi to identify them. Since the
syntax is identical to that of Python, it would be best to
identify it that way.
Merge branch 'master' into more-687
Place guards, checks for multiline shell hacks
Update samples
2.10.1
Merge pull request #816 from sgallagher/master

Add .lmi to Python extensions