Remove setting of COMP_WORDBREAKS
Remove setting of COMP_WORDBREAKS

In some cases on Mac, we receive  "Trace/BPT trap: 5" error which is caused by incorrect value of COMP_WORDBREAKS environment variable. Remove the code which is adding values to it as we do not use = and @
This way we reduce the chance of setting incorrect value for this variable and if a problem with its value is detected, it should be traced back to npm or current system configuration.

Fixes http://teampulse.telerik.com/view#item/281740

Icenium/node-tabtab,Icenium/node-tabtab