Set keepAlive on connected socket.

#198
Merge pull request #199 from ravensteel/198

Set keepAlive on connected socket.
datatypes: Write Partially Length Prefixed streams with unknown length. fixes #197
1.5.3
1.5.4
colmetadata: Add column name replacer option. fixes #200
1.5.5
Fix rowCollectionOnDone and rowCollectionOnRequestCompletion
Release 1.5.6