Added request attribute annotation.#119

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royteeuwen wants to merge 3 commits intowttech:masterfrom

royteeuwen:feature/injectable-request-attribute

Commits on Oct 13, 2017

Added request attribute annotation. Can be used together with data-sly-use=${'com.cognifide.slice.TestModel' @ myAttribute='aValue'} to read out the attribute
royteeuwen
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Fix the request processor by using the servlet request (which is always available, in contrast of sling servlet request)
royteeuwen
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Make request nullable because in the unit/integration tests it might not be available
royteeuwen
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