DOC: Fixed file tree
Merge pull request #6 from ericdill/spec_input

DOC: Fixed file tree
REF : proposed modifications to img_subtraction_pre
Merge pull request #9 from tacaswell/dc_fixup

REF : proposed modifications to img_subtraction_pre
DEV: Added fileops module to new io folder in nsls2

This module contains basic fuctions for loading common image file types
including netCDF, tiff, raw, some HDF5 functions, and the original
extension-based parent loader load_reconData
DEV: Added initial set of image processing tool modules for segmentation.

Modules are broken down based on the type of operation performed by the
functions they contain. e.g. filterops contains all functions that
have been added or collected which filter image data, threshops contains
thresholding functions, etc.
DEV: added mods to synth_drawing.py

The mods that have been added include (elipsoid and cuboid) are still
not functional and need to be completed.