Merge pull request #283 from formapro-forks/use-real-amazon-libs-in-dev-envs

[tests] use real amazon libs in tests.
use psr logger
add a note about changed logger interface
Merge pull request #286 from formapro-forks/use-psr-logger

[1.0][Logger] use PSR one logger
# This is a combination of 3 commits.
# The first commit's message is:
[resolver] do not expose targetPath.

Conflicts:
	Imagine/Cache/Resolver/AmazonS3Resolver.php
	Imagine/Cache/Resolver/AwsS3Resolver.php
	UPGRADE.md

# This is the 2nd commit message:

use path and image vars names instead of originalXXX

# This is the 3rd commit message:

[resolver] use path to remove cached images.
[resolver] do not expose targetPath.
remove "targetPath" from bundle dictionary