Added note about possible load_data failure in standalone Sherpa
Make Anaconda the recommened install
Remove a lot of options fomr install page
Merge pull request #5 from DougBurke/master

A note from yesterday's presentation
Simplify and reorganize installation instructions
Address comments from PR review; fix sphinx ref errors; whitespace cleanup
Change 'The easiest and fastest' to 'An easy and fast'
Merge pull request #9 from python4astronomers/hamogu-update

Update primary recommendation to Anaconda and simplify