DEV Added documentation for netCDF loader and began aviso_fileIO defs

Currently avizo_fileIO definitions are still non-functional and need
additional work in order to finish converting IEEE binary data format
into numpy array for our use.
DEV File-IO: Finished the amiramesh reader

I figured out how to separate the header from the binary data
the function then rearranges the resulting 1D float array into
the correct array size for the loaded volume.
TODO: Still need to update the documentation for this function
TODO: Still need to finish the md_dict generator function
TODO: Also, should get the amiramesh reader to pull the array dimensions
direcly from the file header. Currently this needs to be input directly
TODO: Develop a test run for the testing suite.
DEV: Added functions for parsing AmiraMesh header into md_dict

Created two new functions:
1) sort_amira_header: distils original header list  down to only
information that should be included in the header. Removes all new
line characters and white space.
2) create_md_dict: extracts all data pertinent to the loaded file
and generates a dictionary of all the important metadata.
DEV: Additional updates to avizo_io
DEV: Updated documentation for several functions.
Still work in progress.
TMP: This is a test to check connectivity with github
TMP: Fixed SSH remote issue. Removing tmp file
DEV: Pushing final avizo_io functions and updated documentation to fileops

Still in progress.
DEV: Added metadata keys to core.py and cleaned up avizo_io.py

Created two additional files. The first is a sample header for
AmiraMesh Binary data sets to use as reference, or for informational
purposes. The second is the beginning of a test file for avizo_io.
DEV: Added several initial place holder test functions
BUG: Fixed extra characters error associated with md_dict assignment

Previously, original header contained additional characters in
the data type string (additional comma) and coordinate specification
(extra quotation marks). Now these characters are removed so that
dType specification types match md_dict entries.
DEV: Added loading functionality for both ASCII and BINARY file types

Both file types are now able to be loaded using this tool.
Test data sets are available for testing and evaluation.
Still struggling to build up the testing functions for this tool.
DEV: Moved avizo test script and sample header to testing folder
DEV: Addressed comments on avizo_io.py

Still have to address and finish cleaning up fileops.py
DEV: New branch including only avizo file IO related files

Removed fileops.py so that pull requests focused on avizo file-IO
will only include updates to the avizo file-IO functions. Fileops
is also being reduced to a series of files each focused on a separate
file type IO functionality.
DEV: Pythonic improvements to code as per Tom's comments
DEV: Pythonic code improvement as per Tom's suggestions
DEV: Removed fileops.

The fileops module is being broken out and fileIO tools that
are particularly pertinent are being broken out into separate
files for ease of reference, PR, and modularity. Each filetype
will have its own branch so multiple file type functions can be
in development at same time.
DEV: Changed try/except to appropriate if/elif code commands

While the try/except format that was included originally worked,
using try/except without expecting an exception to be raised
when the try function fails is an inappropriate use of the try
function. Using if/elif statements is more appropriate for what
I am trying to do, which is to selectively populate a metadata
dictionary by reading lines from the original header string.
DEV: Converted try/except functions to more appropriate if/elif

While the original try/except function series worked for the metadata
dictionary population that I was attempting, the use of if/elif
is more appropriate since try/except expects an exception to be raised
if, or when the try function fails. Since I am simply reading the
original header string and populating a new metadata dictionary the
use of if/elif is more appropriate.