1. Open directories in filter mode
2. Fix arrow keys not working after filter selection (due to invalid cur entry)
3. Support `Insert` key to clear filter prompt
4. Update documentation

Add Debian and Fedora package installation option.

Reasons:

gnome-search-tool is much more powerful than other tools in its category. It
supports numerous search parameters like size, modification date and supports
text search.

* Bring back plain builds

* Bring back plain builds

* Bring back plain builds

* Bring back plain builds

Limit all xstrlcpy() calls by dest length.
Escape filenames in system(3) calls.

We are converting multi-byte to wide char and vice versa to replace the escape
chars with ?. Otherwise we run the risk of breaking a Unicode code point.

* Add automatic RPM builds via travis

* readline.h must be imported after stdio.h to pick up def of FILE

1. Strip end spaces and slashes
2. Do NOT change dir if in the same dir
3. Don't go back beyond startup dir with '-'
4. Reset oldpath on cd (other than cd . and ..)
5. Reset filter
6. Update features in README