updated joining process
add list of members
Add sponsoring members back into the description including the current levels.
Change percentage discount and add statement regarding voting privileges.
MAINT: fix image paths for Pelican 3.3 - "static/" was removed in that release.
DOC: fix typo in README
remove spurrious spaces from membership
Add JPMorgan PyData story.
Rename file.
Merge pull request #61 from teoliphant/master

Add story about JPMorgan and PyData conference
modified wording for membership categories in response to board meeting comments
fixed formating on emeritus section
Merge pull request #63 from perrygreenfield/membership

Membership
Merge pull request #59 from numfocus/membership

updated joining process
Merge pull request #60 from rgommers/fix-image-paths

Fix image paths for Pelican 3.3
MAINT: add mission statement to the top part of the site.
MAINT: explain name NumFOCUS on the About page.
wit updaet
Update README.md
Update README.md