bit of renaming , cleaning and documentation

lib/elf/README.markdown

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+Minimal elf support
+===================
+
+This is really minnimal and works only for our current use case
+- no external functions (all syscalls)
+- only position independant code (no relocation)
+- embedded data (into text), no data section
+
+I was close to going the wilson way, ie assmble, load into memory and jump
+
+But it is nice to produce executables. Also easier to test, what with segfaults and such.
+
+Executalbe files are not supported (yet?), but object files work. So the only thing that remains is to
+call the linker on the produced object file. The resulting file is an executable that actually works!!
+
+Thanks to Mikko for starting this arm/elf project in the first place: https://github.com/cyndis/as
+
+This part definately needs tlc, so anyone who is interested, dig in!