Update Syntastic settings in vimrc.

Use gcc rather than clang, and set some good options
(particularly to ignore c++98 compatibility,
since I'm always using c++11).
Clean up old plugins I don't use anymore in vimrc.
Turn-off line numbers in vimrc.
Remove window-movement mappings in vimrc.
Make tags generation a mapping, not an autocommand.

Now the tags file will be updated when I press <F9>,
rather than automatically upon saving a buffer.
Add a user-defined command Asm to vimrc.

This command opens a disassembly of the given file
in a new split window.
Add 'make test' shortcut.

Use the <F6> button to run 'make test'.
Properly source global bashrc file.

Since I had copied this from my previous Fedora
distro, the global bashrc source was incorrect.
This fixes the color ls problem I had previously
needed to manually fix.
Customize gdb.

This involves:
        1) Adding a .gdbinit file. This sets the disassembly
                flavor to intel
        2) Adding an alias to bashrc so gdb always opens
                in tui mode
Default in .ycm_extra... to no=c++98-compat.
Use clang with Syntastic, rather than g++.

This is to mirror YouCompleteMe's usage of clang.
Remove all Vundle plugin stuff.