Added SHA256Worker implementation with web worker support and fallback.
Just an axample use of SHA256Worker
Merge branch 'development' into sha256-custom
Moved ssh256 into separate package
Chunk processing feature added, web worker only
Minor cleanup in sha256 worker.
Finished support for chunks in fallback worker and unordered chunks buffering
Added test file for sha256 package and moved crypto into sha256 package
Separated server from client SHA256Worker
Minor bug fix
Implemented sha256 functionality in Crypto
Started working on tests for Crypto
Modified WebWorker wrapper so that it communicates synchronically with web worker
Added support for file/chunk buffering, not finished
Merge branch 'development' into sha256-custom

Conflicts:
	.meteor/packages
API simplification and cleanup.
Test some edge cases (supported features) to fine-tune the strategy.
few fixes to package tests
remove HTTP package as it is no longer used in tests.
Export Crypto, remove Digest as package and make it internal.