more robust string table accesses, esp. useful for already loaded (dumped) files
parse more dynamic info
add rudimentary coredump plt example script
Merge branch 'master' of https://github.com/eliben/pyelftools

Conflicts:
	elftools/elf/dynamic.py
prefer p_vaddr as offset for DynamicSegment if elf has loadbase
properly handle non-ASLR binaries

- non-ASLR binaries have their "base" address added to all p_vaddr
  segment headers
- subtract minimal p_vaddr (= base address) when adding loadbase