Updating documentation

Updating Documentation to include more details on how to install and
get running.
Updating text

Fix heading tags in file
Updating list ordering
Updating spaces
Minor formatting changes
Update wording

Updating open-him-js to openhim-core-js
updating URL

Update local URL
update spelling

update spelling of node
Updating Testing details

Changing the wording to better reflect the test are one in the same and
not 2 separate styles
Merge pull request #17 from carlsbox/master

Update to Readme.md