fix build with PHP 5.3.3
Fix: crypto_alg.c:326:7: warning: 'copy_success' may be used uninitialized in this function [-Wmaybe-uninitialized]
Fix buffer overflow, fix #7
Fix buffer overflow (2), fix #7
Link to shared library, fix from Gasol, fix #5
Merge pull request #6 from remicollet/master

Fix for version 0.1.0