add the ability to define words that will instantly exit intellisense

[ChristopherJTrent]

I would like the option to say (for example) that in ruby files, if the word that intellisense is trying to make suggestions about is "end", that it will automatically exit and not try to suggest anything.

desired behavior (example, specific text would be user-definable):

• type e (intellisense pops up)
• type n (intellisense stays up)
• type d (intellisense closes automatically)
• press left arrow, up arrow, tab (cursor is now indented inside the block I have just closed.)

Current behavior:

• type e (intellisense pops up)
• type n (intellisense stays up)
• type d (intellisense stays up)
• press left arrow (cursor moves left)
• press up arrow (intellisense intercepts the keystroke and selects the bottom-most option)
• press TAB (intellisense replaces the end that I wanted to type with the syntax-error causing word 'extend')