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.
remove spurrious spaces from membership
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