Implemented REMOTE_USER Authentication

This authentication mode requires an upstream proxy which sets the
REMOTE_USER header. This is rather common in enterprise environments
which use LDAP/Kerberos authentication. This module is largely a copy
of the BrowserID authentication module
moved it up to the top
merged in color changing code
changed text
#19 color schem pull request
Update ChangeLog.md
Merge remote-tracking branch 'origin'
updated for version release
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#63 - fixed gff3 and fasta export