added function comments to NIST
moved identifying and distribution of parsing of tables to a new function parse_tables
removed unneeded class variable cfg
made get_unit function
added function comments to ChemSpider
moved scraping of Predicted - ACD/Labs tab to its own function
moved scraping of experimental data tab to its own function
moved import and removed TODO
added absolute path to reading sources.cfg
sample sources.cfg
PubChem was added
Gammar error
Merge remote-tracking branch 'origin/develop' into develop
Merge branch 'feature/ChemSpider-cleanup' into develop

Conflicts:
	FourmiCrawler/sources/ChemSpider.py
Merge branch 'feature/NIST-cleanup' into develop

Conflicts:
	FourmiCrawler/sources/NIST.py
Merge branch 'feature/sourcescfg_fixes' into develop
Added the changes so far into the changelog
made parse_searchrequest function to parse search page and modified new_compound_request accordingly
The cool folder seperators!
These regular expressions where all wrong