Write random word

Words from a long string are split and placed into an array. A random
number generator will then pick out a random word from the array and
write it into the target.

Also made it so that when you press return, the input box is cleared.
Wrote in instructions
random number range adaptive

the random number generator will now pick a number between 0 and the
number of objects in the dictionary.
added more words

many more random words
5000 most common words

replaced the word collection with the 5000 most common words in English
opening text change
removed the log of the dictionary array
Merge pull request #12 from yuanphoon/10_randomised_target

10 randomised target