Add missing console support to Internet Explorer.

Internet Explorer doesn't support the console functions unless it's running in developer mode. As a result it throws it's toys out the pram when a call is made to one off the console functions.

Add the console functions if they are missing.
Update change log for issue #70.
Merge pull request #70 from fyfe/fix-issue-70

Add missing console support to Internet Explorer.
Update README.md

(Issue #69)
Add installation instructions to README.md

(Issue #69)