adding more detailed readme for config
Update config_readme.md
Update config_readme.md
fix issue #20 (crash on downloads for windows)

error due to known bug in windows for multiprocessing, specifically threads.py.  see:
        http://stackoverflow.com/questions/18204782/runtimeerror-on-windows-trying-python-multiprocessing

for explanation
Merge branch 'iss20-WindowsDownloadCrash' into develop
stability and clarity improvements

+ cleaned up config_readme
+ version now tracked in separate file, and printed on start
+ wrote function for basic validation of config file
+ style/cleaning throughout e621dl.py
+ changed log style (in source only, not in actual output)

+ combined read/make functions into get() functions for tags and config
created bug report page
fix previous commit, move page to docs
Update reporting_bugs.md
Add sections for Config and Bugs
Merge issue #20 fix, other improvements, for v2.3.5