Changes made:

1. Warm up strings clustering based on blackberry code.
2. Characters no longer show on the keyboard.
3. Removed the timer on the top of the screen.
4. Changed stuff so that the words per minute timer starts only on the
first key down of each string.
5. On each block level message, removed the block number and made the
metrics easier to read.
6. Allowed user to submit a string only if there are minimum of 5
characters entered.