Fixing duplicated go call https://github.com/shower/shower/issues/191
Updating min version
Adding debug-mode flag
Updating min version
Adding possibility to override any shower property before init.
Merge branch 'operatino-debug-mode'
Code style bits
Merging
Fix issue with shower breaking when loaded from head.

Introduced new shower.run() method. Variable 'body' was replaced by
'document.body' almost everywhere to overcome problems with body being null.
Should fix #130.