Installation doc
Add documentation on bundle usage
Documentation link in README
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Document image usage
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Add info on unit tests
Add reference documentation on Manager classes
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Precision on file path construction documentation

Property visibility is often forgotten, this reminder will help.
Merge pull request #1 from skwi/patch-1

Precision on file path construction documentation
Merge pull request #15 from jdecool/documentation

Documentation
Revert "Abstract filesystem usage for testing"

This reverts commit 19b070d66bc35b4b5e42c38788b887716041dcc6.

Conflicts:
	Manager/BaseEntityWithFileManager.php
	Tests/Units/Adapter/FilesystemAdapter.php
Merge branch 'master' of https://github.com/jdecool/NovawayFileManagementBundle into manager-testing