Fix: Added indention for case-block

We should indent this if we need a block inside a case-statement like
so, which is _much_ more readable for long switch(-case) blocks, as we do
not visually collide with the closing bracket of the switch block.
Revert "Removed apostrophes"

This reverts commit 39e5504d9b470c386fe412108b67a85ed6c0dba3.
Add likely.h

This adds the likely() and unlikely() macros for branch condition
optimization.
Merge pull request #23 from matthiasbeyer/add-likely_unlikely_macros

Add likely.h
Merge pull request #22 from matthiasbeyer/revert-wrong_typo_fix

Revert "Removed apostrophes"
Merge pull request #20 from matthiasbeyer/fix-code_example_in_contributing_file

Fix: Added indention for case-block
Added include/libreset/hash.h

This adds the include/libreset/hash.h file for the export of the hash
type used by the library.
Added documentation note about handling the rs_hash type