remove inter spatial layer prediction in parameters
Merge pull request #341 from ruil2/cleanup

cleanup encoder parameters--- review request #108
Merge pull request #342 from volvet/rm-unsupported-para

remove inter spatial layer prediction in parameters
cast to uint32_t in GET_WORD to prevent possible left shift error.
Merge pull request #343 from huili2/cast_get_word

cast to uint32_t in GET_WORD to prevent possible left shift error.
refine level check
Merge pull request #344 from licaiguo/fix-level-check

refine level check
fix int conversion warning, using LD32/ST32
use active SPS parameters instead of other SPS.
Merge pull request #345 from licaiguo/fix-int-conversion-warning

fix int conversion warning, using LD32/ST32
Merge pull request #347 from huili2/active_sps_ref_size

use active SPS parameters instead of other SPS.
Use -dynamiclib instead of -shared for building shared libraries on OS X

Older toolchains don't recognize the -shared parameter.
Add the necessary directories to the include path within xcode

This is not necessary when using precompiled headers.
Remove unnecessary precompiled headers

This reduces the huge amount of near-useless small extra files
scattered around for the sake of the platform demo projects.

This requires explicitly listing all the ncessary include paths.
Merge pull request #348 from mstorsjo/darwin-dylib

Use -dynamiclib instead of -shared for building shared libraries on OS X
Add an SHA1 implementation by Paul Jones
Make the SHA1 header compatible with C++
Make the SHA1Result function write the output into a byte array
Use the bundled sha1 implementation instead of relying on openssl

This simplifies running tests on platforms where OpenSSL isn't
commonly available.
Use the local sha1 function names directly without compatibility defines