Fixed less compiler error handling

Fixes #1541.

It seems that the errors passed to the callback that takes the Less AST
can be more than just Objects.

Added unit tests so that we'll detect this in future.
#1305 Results restructing highlights and updates
Merge pull request #1541 from jroper/1541-less-fix

Less compiler error reporting broken for imported files
Merge pull request #1540 from benmccann/less-1.4.2

Upgrade the less compiler to version 1.4.2
Merge pull request #1554 from jroper/1305-docs

Results restructing highlights and updates
More highlights
Merge pull request #1525 from huntc/thread-doco-update

Update thread pool doco
[doc] fix a couple of small typos.
Merge pull request #1555 from wsargent/patch-6

[doc] fix a couple of small typos.
Merge pull request #1550 from edofic/patch-1

add play2-sprites to modules in documentation
Fix documentation typo
Merge pull request #1557 from benmccann/docs-typo

Fix documentation typo
modified naming
Merge pull request #1551 from ebiggs/master

made it possible to retreive the internal jdbc connection composed by Au...
Updated SBT link documentation
initial commit
Added flyway plugin to Modules.md

Flyway plugin supports database migration with Flyway(http://flywaydb.org/).
Merge pull request #1537 from jroper/license-report

Added license report task
Merge pull request #1542 from wsargent/1542-update-scalaws

[doc] More WS documentation, worked examples
use Ok.chunked instead of deprecated Ok.stream