Merge pull request #49 from shlasouski/master

Fix bug related to isAsync flag
Update NevadoBytesMessage.java

_log should not be serialized!
Update NevadoStreamMessage.java

_log should not be serialized!
remove unused methods
change way of checking Amazon client
remove unnecessary sources
make _isAsync as final
return null messageId if it's isAsync
Merge pull request #50 from shlasouski/master

Override methods of AmazonSQS, AmazonSNS to provide real asynchronous send messages.

Nice work Serg!
Update NevadoBytesMessage.java

Fix log definition.
Update version information for fix release.
Update MessageIdUtil.java

Add ID: prefix
[maven-release-plugin] prepare release nevado-1.2.1
[maven-release-plugin] prepare for next development iteration
Merge pull request #2 from skyscreamer/master

sync
Merge pull request #3 from shlasouski/master

sync