Update SBTSubProjects.md
note on Build.scala in modules

Add the comment as a note.
Fix incorrect regex

The ".*" regex described under "Dynamic parts spanning several /" does not match the actual functionality of the framework.

For instance, if I describe the route:
GET /blah/*path

...it will not match /blah/
Fix small typo in ScalaHttpFilters.md

Global was written as Glodal. Just fixed that.
Fix exception in Reads.traversableReads when JsArray contains a stream

See the new test case. When the Seq contained in JsArray is a lazy
stream, the former implementation of `traversableReads` was throwing an
exception. Because the `ts.zipWithIndex.map` on line 457 is executed
lazily, it does not set the mutable flag `hasErrors` to true. So line
474 `r.foreach(builder += _.right.get)` can be reached even if `r`
contains `Left` values.

This commit removes both mutable flag `hasErrors` and unsafe function
`Either.get`, fixing the bug.

For consistency with new implementation of `traversableReads`,
`mapReads` was rewritten as well.
Update ScalaWebSockets.md

Correcting small typo in comments
Merge pull request #2486 from ornicar/fixReads

Fix exception in Reads.traversableReads when JsArray contains a stream
Merge pull request #2487 from gabriel-bezerra/patch-1

Fix typo in ScalaHttpFilters.md
Added support for having external Play modules documented
Add hostname verifier
Update the default TLS protocol used to the highest available by default, remove insecure protocol.
Add hostname parameter class name
Merge pull request #2509 from wsargent/fix-hostname-verifier

Fix hostname verifier
Ensure exceptions from JUnit tests are logged
Merge pull request #2535 from benmccann/test-errors-2.2.x

Ensure exceptions from JUnit tests are logged
Minor spelling correction from 'backage' 'package'
Change from map to flatMap
Merge pull request #2540 from WarFox/patch-1

Minor spelling correction from 'backage' 'package'
Remove mentions of the iteratee thread pool that was removed in Play 2.2
Merge pull request #2541 from wsargent/fix-doc-ws-flatmap-future

Fix doc ws flatmap future
ProxyPassReverse should refer to cluster

When Apache is used for load balancing, directive ProxyPassReverse should refer to the url of a balancer instead of the individual urls of the backend systems.
Update Modules.md

Google's HTML Compressor has now a Java API too.