Fix bug again!

* Added rspec tests related to allowing whole word guesses
* Discovered bug that caused a word guess containing any letters in the answer, but not a complete match to still
  be evaluated as a valid guess
* Changed code to fix this
Multiple improvements

* Slight changes to positioning of things within 'lives_container'
* Added stylized border to the 'trash' area & other minor changes
* Split trash into 2 section: letters and words
* Made code changes to support above
Bug fix regarding regex in validator

* regex allowed trailing special characters (e.g. 4,', !) as valid input
* Altered regex to fix bug
Lots of bug fixes, changes and ammendments

* Capital letters were being treated differently if a user guessed with a capital letter.
* Added rspec tests for letters being treated the same regardless of the case.
* Multiple changes throughout code to accomodate this design choice and bug fix.
* Updated code to store correct guesses so that an appropriate prompt message can be displayed to a user when they try to enter it again.
Another bug fix

* Whole word guesses of random casing (e.g. "aNIMaL") were regarded as an invalid guess regardless of whether it was correct
* Updated code to downcase a whole word entry before checking validity
* Added rspec tests to help work towards fixing bug (done)
* Applied change in cucumber tests to fix a failing test caused by previous changes to code.
A set of small changes

* Reversed a change in word generator (was changed for testing purposes)
* Updated validator to treat white space the same as entering nothing for a guess
* Added a new game button to webapp
* Added some CSS styling to new button and existing button, plus some other slight visual changes.
Updated validitor again to correct a bug

* Validator dealt with white space but would allow guess with whitespace among other characters (e.g. "abc   def", "a b", " ab")
* Altered the error prompt that is displayed to user
Various changes to views of webapp
More changes to views in webapp
* Added an image that is swapped out to represent lives being lost
* Added an image to game over view
* Hangman image appears at the start of the game
Small updates to views