Merge pull request #3002 from ahmetmircik/fix/3.3/writeCoalescing

Makes default write-behind mode as write-coalescing
C# client name changed as .NET client
Update in Revision History
Draft of SPI section progressing
Merge branch 'master' of https://github.com/hazelcast/hazelcast
seperated checkstyle and findbugs into different profiles
Merge branch 'master' of https://github.com/hazelcast/hazelcast
WIP
doc improvement for Zendesk #463
mark healthy connection immediately when heartbeat succeeded
rename method as flush
Merge branch 'master' of https://github.com/hazelcast/hazelcast
doc update after customer feedback
Merge branch 'master' of https://github.com/hazelcast/hazelcast
fixes #3001
first part of making write-coalescing configurable
Merge branch 'master' of https://github.com/hazelcast/hazelcast
merge
fixes # #3004
Merge pull request #3017 from sancar/fix/heartbeatMark/master

mark healthy connection immediately when heartbeat succeeded