Remove upgrade note from the server upgrade page
Differentiate DB upgrade step between 4.4.x and 5.0.0-beta1 servers
Add section about JCM memory settings
Remove temporary server-migration-fs page
Add documentation for password provider changes to support salting

This commit modifies the sysadmin and developer documentation to document
the latest changes to the password provider including pasword salting support.
Fix the DB upgrade command for 5.0.0-beta1
Rewrite optimization lines to include quotes as tested in the job
Try to improve the sentence about reverting salting
Merge pull request #557 from mtbc/model-changes

remind that model changes may affect IceMapper
merge develop -D org -I include -E exclude: PR 533 (Removing BF anchor until it exists)
merge develop -D org -I include -E exclude: PR 572 (Adding contributing docs to OME docs repo readme)
merge develop -D org -I include -E exclude: PR 573 (Continous integration fixes)
merge develop -D org -I include -E exclude: PR 574 (Update web application development page for Django 1.6)
merge develop -D org -I include -E exclude: PR 576 (Review server upgrade and password provider pages)