Reverted to basic compilation (32-bit binaries) of a shared object
Fixed install script
Minor changes to iscore.pro and install.sh

iscore.pro: removed -m32 flag from linux-g++-64 options (not needed)
install.sh: added -s flag to ln arguments so it creates soft links
install.sh for dylib: first version
Fixed MacOS compilation
Removed creation of libIscore.1.0.dylib symlink in install.sh
Added libIscore.* to .gitignore