First stage of conversion to using autotools. Cortex-M3 and 2dfir implemented.

Scripts are provided to pass correct flags to the compiler, depending on the
processor that is targetted. Initially a script is provided for ARM Cortex-M3
(STM32VLDISCOVERY). A valid linker script must also be provided.

    * .gitignore: Updated to ignore autotools byproducts
    * AUTHORS: Created
    * configure.ac: Created
    * generate.cortex-m3: Created
    * INSTALL: Created
    * Makefile.am: Created
    * NEWS: Created
    * README: Created to point at README.md
    * src/2dfir/Makefile.am: Created
    * src/common.mk.am: Created
Added the rest of the benchmarks to the autotools config

    * Makefile.am: Added the rest of the benchmarks
    * configure.ac: Added the rest of the benchmarks
    * src/blowfish/Makefile.am: Created
    * src/crc32/Makefile.am: Created
    * src/cubic/Makefile.am: Created
    * src/dijkstra/Makefile.am: Created
    * src/fdct/Makefile.am: Created
    * src/float_matmult/Makefile.am: Created
    * src/int_matmult/Makefile.am: Created
    * src/rijndael/Makefile.am: Created
    * src/sha/Makefile.am: Created
    * src/blowfish/Makefile: Removed - generated by automake
    * src/crc32/Makefile: Removed - generated by automake
    * src/cubic/Makefile: Removed - generated by automake
    * src/dijkstra/Makefile: Removed - generated by automake
    * src/fdct/Makefile: Removed - generated by automake
    * src/float_matmult/Makefile: Removed - generated by automake
    * src/int_matmult/Makefile: Removed - generated by automake
    * src/rijndael/Makefile: Removed - generated by automake
    * src/sha/Makefile: Removed - generated by automake
Fixed cross compilation issues with configure.ac

    * configure.ac: Fixed host_alias being set. Use $host_alias instead
    of $host for cross compilation checks
    * generate.cortex-m3: Added shebang
Small fixes to make cubic and rijndael build correctly
Compiling in sbrk, jrand, etc is now conditional, selected by configure.

    * configure.ac: Added options to compile in extra platform code
    * generate.cortex-m3: Enable platform code
    * src/2dfir/Makefile.am: Conditionally compile in platform code
    * src/blowfish/Makefile.am: Likewise
    * src/crc32/Makefile.am: Likewise
    * src/cubic/Makefile.am: Likewise
    * src/dijkstra/Makefile.am: Likewise
    * src/fdct/Makefile.am: Likewise
    * src/float_matmult/Makefile.am: Likewise
    * src/int_matmult/Makefile.am: Likewise
    * src/rijndael/Makefile.am: Likewise
    * src/sha/Makefile.am: Likewise
    * src/platformcode/platformcode.h: Conditionally disable jrand
Added scripts and fixes for AVR support.

    * src/rijndael/aesxam.c: Fix to compile on AVR
    * generate.avr: Created.