AutoTAB feature

[ndlopez]

Added a new function to auto TAB for the next input. It kinda works up to last letter of a word. Where it should jump to next word.

[ndlopez]

Being autoTab if wrong input jumps to next, should wait til correct input.

[ndlopez]

Once a word is guessed completely, last letter triggers a dom null object error.

[ndlopez]

Once autoTAB reaches last letter of word the following error occurs:
Uncaught TypeError: document.getElementById(...) is null
Fix this issue together with issue #5