Add 'sar' opcode for 32 and 64bits in x86.nz
Lot of bugfixes in r_asm, x86 assembler and ragg2 -x

- Thanks Ripe for reporting
- Handle $pc in r_asm assemble
- New ops for x86.nz: sar, shl, shr, shl, rcr, rcl, ror, rol
- Fix disassembler indentation for functions
- Fix memory align issue in r_sys_run()
Fix rasm2 -d - (without -f)
Fix armthumb disasm, 64bit inc/dec on x86, syscall in r_asm

- rasm2 -k to select kernel like ragg2 does
- rasm2 -k linux -b32 'mov eax, $sys.write'
- Implement x86-64bit INC and DEC
- Add x86-8 and x86-64 bit calling conventions in r_syscall
Fix .string and .ascii directives
Fix loading of MACH0 object files and fix build
Add r2 -A and -k, implement stackptr for udis86, update manpage
Fix stack analysis on 64bits
Fix infinite loop in VT and minor tweaks in '?' help
Accelerate visual disasm mode
Use '$$' instead of '$pc' in r_asm_assemble()
Fix debug of 32bit programs on 64bit boxes
Fix corner case when loading huge files with strings
Add "show mountpoints" option to fs vmenu
Rewrite DEX parser
Fix bindings, loading strings of unknown filetype
Update doc/iphone and fix build on iOS
Store CFLAGS in configure, fix build race condition and rabin2 -zz

- Try to fix the race condition in build
- Fixes for rabin2 -zz (show strings when opening an unknown file type)
- Store CFLAGS and LDFLAGS at configure stage
Fix issue in r_cons_grep()
VAPI/r_bin: updated to match changed static string size.