Update README.rst

Enhanced readme.rst by adding step-by-step "copy&paste" style instructions.
Add reveal working tips to README.
Merge pull request #4 from damianavila/add_reveal_readme

Add reveal working tips to README.
Update README.rst

Defaults were changed so --write and --stdout don't need to be mentioned in quick export.
Merge pull request #169 from jdfreder/master

Readme updates