add to index and show game imaga
Merge pull request #46 from despo/5th-js-tutorial

5th javascript tutorial
Fix typo in function name
Fix typo in heading.
Merge pull request #48 from zoodor/patch-3

Fix typo in heading.
Merge pull request #47 from zoodor/patch-2

Fix typo in function name
Changes getElementByTag by getElementsByTagName
Merge pull request #49 from pvcarrera/patch-2

Changes getElementByTag by getElementsByTagName
Fix typo
Fix typo
Merge pull request #51 from caracolahf/patch-2

Fix typo
Merge pull request #50 from caracolahf/patch-1

Fix typo
add sixth tutorial
Merge pull request #52 from despo/javascript-lesson-6

add sixth tutorial
small wording tweaks
update link to tutorial example
update lesson 6
Introduction to testing
Merge pull request #53 from despo/introduction-to-testing

Introduction to testing
update index to include js tutorial 7