Allow for comments in a cassandra-cli file
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                 Key: CASSANDRA-3769
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3769
             Project: Cassandra
          Issue Type: Improvement
          Components: Tools
    Affects Versions: 1.0.6
         Environment: Amazon Linux w/ Apache Cassandra 1.0.6
            Reporter: Andrew Halloran
            Priority: Trivial


I use the cassandra-cli to create schemas, update schemas, and make other calls 
to interrogate keyspaces and columns. I load pre-written statements from files 
using the -f option, example: "bin/cassandra-cli -host localhost -port 9160 -f 
mystatements.txt". It would be useful if I could comment my statement files 
with comments similar to how you can comment script and C++/Java code.

Example contents of "mystatements.txt" file:
update column family users                    // This is my column which holds 
all my user information
        with comparator = UTF8Type            // My column names are all 
strings so I will use UTF8Type
        and key_validation_class = UTF8Type   // My row key values are also 
UTF8Type
        and default_validation_class = UTF8Type // Column values will be 
UTF8Type
        and column_metadata = [
                {column_name: username, validation_class: UTF8Type}, // This 
column stores the login name of the user
                {column_name: realname, validation_class: UTF8Type}];// This 
column stores the real world name of user


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