Update installation.txt

cleanup
Merge pull request #49 from mariuz/patch-2

Update installation.txt
Thanks mariuz
Merge pull request #48 from KeeperDS/master

Added new services and some constants
add changelog
change prim number from srp.cpp in FB3 a2
remove bits parameter
modify key and key length
pre calicurated u
add client_session()
re create client_proof()
add debug private key
add debug print
add debug print
comment typo
add server_session()
remove functions
fix test_srp.py
Merge branch 'master' into srp
modify for debug
DEBUG=False