Handle ARM relocations (#121)

Handle ARM relocations (#121)

* relocation: handle ARM binaries

* relocation: handle R_ARM_ABS32 for ARM machines

* testfiles: add reloc_arm_gcc.o.elf

Generated on Ubuntu 14.04 using: arm-linux-gnueabi-gcc-4.7 -c -g -o reloc_armhf_gcc.o.elf hello.c

* testfiles: add reloc_armhf_gcc.o.elf

Generated on Ubuntu 14.04 using: arm-linux-gnueabihf-gcc-4.7 -c -g -o reloc_armhf_gcc.o.elf hello.c

* readelf: print soft-float abi for ARM if EF_ARM_ABI_FLOAT_SOFT in flags

* readelf: print hard-float abi for ARM if EF_ARM_ABI_FLOAT_HARD in flags

* readelf: print BE8 info for armeb binaries

* testfiles: add simple_armhf_gcc.o.elf

    Generated on Ubuntu 14.04 using: arm-linux-gnueabihf-gcc-4.7  -g -o simple_armhf_gcc.o.elf hello.c

* elf: remove unwind from dicts and set ARM_EXIDX description

* testfiles: add  reloc_armsf_gcc.o.elf as soft float testcase taken from binutils 2.30

* testfiles: add reloc_armeb_gcc.o.elf as arm big endian testcase taken from binutils 2.30 testcase arm-be8

* readelf: print endian info LE8 if flag was set in header flags