fixed issue #79
Merge pull request #82 from YaroslavLitvinov/issue79

fixed issue #79
fixed issue #81
Merge pull request #83 from YaroslavLitvinov/issue81

fixed issue #81
Use INSTALL file as repo README file
Add some Markdown syntax to the README
Use title-casing in headings
Wrap long lines
More uniform use of empty lines
Merge pull request #85 from mgeisler/readme-cleanups

Readme cleanups
Makefile: remove trailing whitespace
Merge pull request #86 from mgeisler/master

Makefile: remove trailing whitespace
new abstraction layer open_file_description added to filesystems, related to issue #78
pread, pwrite info added into status file
pread,pwrite offset fixed for InMemoryFs
dup/dup2 code pieces added
tests for pread, pwrite and dup added
fixed dup entry point
dup test updated, added inMemoryFs test
Devices fs right offset handling