Check whether tile has already been cloned. If true, display warning
Provide a link to the environment if it has already been cloned
Use innerHTML instead of appendChild(document.createTextNode())
Prevent env from being re-cloned if user presses Back on env page; redirect to new-env instead.
Allow signed in user to delete their environments
the user-arrow now behaves the same way the rest of the header does.
Merge pull request #60 from Precise-Pixels/env-delete

[READY] Allow signed in user to delete their environments
tidied up the js with some nudges and combining the lines.
Open already cloned link in new tab
Clicking marker on homepage map opens env in new tab
Merge pull request #53 from Precise-Pixels/env-map-prevent-duplicate-clones

[READY] Prevent duplicate environment clones
fixed the transition speeds of the header and the user arrow so that they match.
changed the background color to brightness.
changed the js for the header to animate rgba instead of a background color.
changed the js so it now applys a class instead of changes the background color.
cleaned up the js and the css so the css class is for css arrow and top-bar.
No need for rgba anymore
Merge pull request #61 from Precise-Pixels/user-nav-arrow

User arrow behaviour (it's been bad.)
Merge branch 'master' into env-page2

Conflicts:
	includes/scripts.php
	js/capture-env.js
	js/new-env.js
Merge branch 'env-page2' of github.com:Precise-Pixels/cell into env-page2