Add experimental feature flagged no_std support#28

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ZackPierce wants to merge 4 commits intoBurntSushi:masterfrom ZackPierce:no_std_feature_flag

+158-81

Commits on May 2, 2018

Add experimental feature flagged no_std support
ZackPierce
committed

Commits on May 3, 2018

Rename use_std to std; exclude streaming finds from no_std
ZackPierce
committed
Remove hashmap_core due to non-optionality of dev-dependencies
ZackPierce
committed

Commits on May 7, 2018

Remove cfg-if, use more targeted conditional compilation
ZackPierce
committed