Corrections for andes-client & fixes to support SSL in andes-client
add refactorings to in-memory store.
Merge pull request #15 from sperera/MB-417

Corrections for andes-client & fixes to support SSL in andes-client
add flow control feature
flow control files added.
Merge pull request #17 from abeykoon/add_flow_control_feature

Add flow control feature
added a new store called AndesContextStore and some refactoring.
Merge pull request #18 from abeykoon/refactor_in-memory-message-store

add refactorings to in-memory store.
modifying flow control feature.
Merge pull request #19 from abeykoon/modify_flow_control_feature

modifying flow control feature.