Fixing spacing, spelling, and punctuation.

Fixed spacing around equal sign on line 19. Fixed punctuation in error
message on line 146. Fixed spelling of "successfully" on line 154.
Standardizing punctuation

Some sentences had punctuation at the end, some didn't. I standardized
the messages so that they always have punctuation at the end.
Standardizing punctuation in display messages

Added punctuation to the ends of sentences in display messages.
Merge pull request #80 from e3betht/master

Fixing spacing, spelling, and punctuation.