Merge pull request #4 from Mirantis/master

Merge with upstream
New tempest tests for Scan.
Minor updates of other tests.
'Scan' request parsing fixed

Fixes bug 1271170
Add missing quotes around column names in queries to cassandra

Fixes bug 1271560
Merge pull request #86 from yyekovenko/master

New tempest tests for Scan.
Merge pull request #88 from ikhudoshyn/bug/1271560

Add missing quotes around column names in queries to cassandra
Merge pull request #87 from ikhudoshyn/bug/1271170

'Scan' request parsing fixed
Merge branch 'master' of https://github.com/Mirantis/magnetodb