Make README formatted
Minor formatting fixes
Use cleaner function call to get num_tokens

Needed because previous grep_log did not work on 2.0
Do not check for unique cf id in all versions

5202 was only added to 2.1
Restrict cfid_test to 2.1 and above

CASSANDRA-5202 was only committed to 2.1, should not check
for unique directories in earlier versions
Do not run udt tests on 1.2 or 2.0
Missed a line when removing reuse cluster functionality
Merge branch 'master' into ccm_develop