Merge pull request #258 from dlatnikov/JFG414_user_creation

Jfg437 - Change log messages. Describe when test is started, when terminated, why terminated
Merge branch 'master' of github.com:griddynamics/jagger into gdmaster
Ignore empty packages in agent queue
some docu preparations
prepare docu for collectors
Fix exchangeClient logs
docu for collectors ready
Merge pull request #273 from kgribov/AgentEmptyPackages

Don't store empty agent packages
Merge pull request #272 from kgribov/master

JFG-469 Refactor InformationCollector
Merge branch 'master' of github.com:griddynamics/jagger into gdmaster
JFG-485 endpoint-query pairs list are reinitialized each time new workload thread starts
jfg-480 Try to use GXT for summary page
no icons in treeGrid
JFG-496 Switch default Serialization to JBoss
custom metric aggregator example added to docu
Merge pull request #275 from kgribov/RefactorPairSupplier

JFG-485 endpoint-query pairs list are reinitialized each time new worklo...
Merge pull request #276 from amikryukov/gxt-branch

jfg-480 Try to use GXT for summary page
Merge pull request #278 from amikryukov/jboss-serialization

JFG-496 Switch default Serialization to JBoss
Try to refactor LogProcessors
hot fix
check if record have been added to tree (couse of asynchronous calls)