Id, sqlite command line, gctx data enclosed by quotes, superfluous white...

re; https://github.com/cmap/l1ktools/issues/1#issuecomment-30558624

Node name should be Id, not id. lines 165,166
Sqlite commands need to have column names enclosed in quotes.  line 63
Some data from gctx files may arrive with enclosing quotes.  
If so another pair should not be added.  lines ~90-100
It is not necessary to call str(item) after testing isinstance(item,str) line 89
Numerous extraneous spaces at end of line removed.