Remove generated coverage report

It isn't necessary to stay on the repo, you can just regenerate them - using grunt - and check for new report
updating package.json
updating tests to work until an uncertainly future
getYear + 1900 === getFullYear and it's not problematic on IE8

Examples:
IE8: getYear() === 2014
Any modern browser: getYear() === 114

IE8 + any modern browser: getFullYear === 2014
Merge pull request #2 from estantevirtual/fixes-ie8

Fixing IE8