DEV: Added functions for parsing AmiraMesh header into md_dict
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.

yugangzhang/scikit-beam,celiafish/scikit-xray,giltis/scikit-xray,hainm/scikit-xray,tacaswell/scikit-beam,ericdill/scikit-xray,danielballan/scikit-xray,licode/scikit-xray,licode/scikit-xray,scikit-xray/scikit-xray,licode/scikit-beam,licode/scikit-beam,tacaswell/scikit-xray,giltis/scikit-xray,yugangzhang/scikit-beam,CJ-Wright/scikit-beam,licode/scikit-beam,danielballan/scikit-xray,Nikea/scikit-xray,celiafish/scikit-xray,ericdill/scikit-xray,danielballan/scikit-xray,licode/scikit-xray,tacaswell/scikit-xray,giltis/scikit-xray,tacaswell/scikit-xray,hainm/scikit-xray,tacaswell/scikit-beam,hainm/scikit-xray,Nikea/scikit-xray,CJ-Wright/scikit-beam,CJ-Wright/scikit-beam,scikit-xray/scikit-xray,celiafish/scikit-xray,Nikea/scikit-xray,ericdill/scikit-xray,yugangzhang/scikit-beam,scikit-xray/scikit-xray,tacaswell/scikit-beam