better Ubuntu Desktop installation instructions
better Ubuntu Desktop installation instructions

Don't suggest that they add to their `.profile` anymore because:

1. They would have to restart the desktop session for their change to be
   reflected, or source the file manually;
2. An error in `.profile` may prevent logging in;
3. The `rbenv()` shell function and shell completions won't be available
   in Terminal since it doesn't start bash in login mode by default.

Therefore, suggest that they use `.bashrc` instead. This will be
immediately reflected in a new Terminal tab. If bash is started in login
mode somehow, the default `.profile` is set up to source `.bashrc` anyway.

Also, don't suggest restarting the shell environment with
`exec $SHELL -l`, since we don't know what was the original mode that
their shell was started in. (OS X Terminal.app will be login mode,
Ubuntu Terminal has non-login mode by default.) Mode can be checked with:

* bash: `shopt -q login_shell`
* zsh: `[[ $options[login] = "on" ]]`

But since this is gnarly, let's just avoid it altogether and go the
easy route.

Closes #305, fixes #373, reverts #286

andrew-christianson/rbenv,lozybean/pyenv,cyril/rbenv,reyesyang/rbenv,bradynpoulsen/rbenv,viclim/rbenv,jmatbastos/rbenv,janusnic/rbenv,Ferocia/rbenv,jasonkarns/rbenv,dongguangming/pyenv,BanzaiMan/pyenv,lozybean/rbenv,lozybean/rbenv,takluyver/pyenv,recruit-mtl/pyenv,rridhan/rbenv,jeremy/rbenv,intfrr/rbenv,sstephenson/rbenv,princeofdarkness76/rbenv,cehoffman/pyenv,golib/goenv,viclim/rbenv,sstephenson/rbenv,cehoffman/nodenv,josegonzalez/rbenv,pumpkineater/rbenv,jasonkarns/rbenv,sheerun/rbenv,peterpih/rbenv,xshwy/pyenv,pyenv/pyenv,cehoffman/rbenv,reyesyang/rbenv,michael-gabenna/rbenv,sstephenson/rbenv,zmwangx/pyenv,silasb/rbenv,andrew-christianson/rbenv,codesdk/rbenv,yyyc514/rbenv,xshwy/pyenv,dongguangming/pyenv,howtolearntocode/rbenv,jeremy/rbenv,howtolearntocode/rbenv,jmatbastos/rbenv,chenfengyuan/pyenv,asaaki/rsenv,sebhahn/pyenv,genome-vendor/pyenv,adarshmuthappa/nodenv,adarshmuthappa/nodenv,docwhat/rbenv,yogeshkakde/rbenv,jeongdeoksu/rbenv,cehoffman/luaenv,yogeshkakde/rbenv,pyenv/pyenv,nodenv/nodenv,sebhahn/pyenv,cehoffman/rbenv,cehoffman/rbenv,VShangxiao/pyenv,dnsd/pyenv,jmatbastos/rbenv,bradynpoulsen/rbenv,yyyc514/rbenv,yyuu/pyenv,pumpkineater/rbenv,sanemat/rbenv,Ferocia/rbenv,jasonkarns/rbenv,jmatbastos/rbenv,UCASREN/pyenv,RinSer/rbenv,OiNutter/nodenv,nodenv/nodenv,beck/rbenv,beck/rbenv,zmwangx/pyenv,obimod/pyenv,fly19890211/pyenv,mediadoneright/rbenv,ffdc-scm/rbenv-x86_64-linux,pumpkineater/rbenv,takluyver/pyenv,RinSer/rbenv,obimod/pyenv,yeonsh/pyenv,OiNutter/nodenv,ffdc-scm/rbenv-x86_64-linux,ox/rbenv,cehoffman/luaenv,jeremy/rbenv,mediadoneright/rbenv,docwhat/rbenv,yogeshkakde/rbenv,Angeldude/rbenv,jmatbastos/rbenv,Ferocia/rbenv,princeofdarkness76/rbenv,fly19890211/pyenv,michael-gabenna/rbenv,LawnGnome/rbenv,hlecuanda/pyenv,Angeldude/rbenv,chenfengyuan/pyenv,josegonzalez/rbenv,dark5un/nodenv,dark5un/nodenv,docwhat/rbenv,josegonzalez/rbenv,genome-vendor/pyenv,UCASREN/pyenv,pyenv/pyenv,stivenrgalvis/rbenv,michael-gabenna/rbenv,reyesyang/rbenv,rridhan/rbenv,beck/rbenv,rbenv/rbenv,mediadoneright/rbenv,rowhit/pyenv,lozybean/rbenv,cehoffman/nodenv,bradynpoulsen/rbenv,princeofdarkness76/rbenv,RinSer/rbenv,peterhoeg/rbenv,talentdeficit/erlenv,janusnic/rbenv,syndbg/goenv,avdhoweb/rbenv,dnsd/pyenv,nebhale/cfenv,VShangxiao/pyenv,stivenrgalvis/rbenv,syndbg/goenv,janusnic/rbenv,SamuraiT/rbenv,jeongdeoksu/rbenv,jeongdeoksu/rbenv,codesdk/rbenv,intfrr/rbenv,SamuraiT/rbenv,cyril/rbenv,cyril/rbenv,habinmusic/pyenv,rowhit/pyenv,jf/rbenv,avdhoweb/rbenv,ffdc-scm/rbenv-x86_64-linux,howtolearntocode/rbenv,recruit-mtl/pyenv,lozybean/pyenv,syndbg/goenv,jrolfs/nodenv,ffdc-scm/rbenv-x86_64-linux,peterpih/rbenv,yeonsh/pyenv,jrolfs/nodenv,sebhahn/pyenv,peterpih/rbenv,hlecuanda/pyenv,stivenrgalvis/rbenv,jmatbastos/rbenv,rbenv/rbenv,rinrinne/ndkenv,BanzaiMan/pyenv,cehoffman/pyenv,Angeldude/rbenv,avdhoweb/rbenv,habinmusic/pyenv,yyuu/pyenv,syndbg/goenv,andrew-christianson/rbenv,intfrr/rbenv,SamuraiT/rbenv,blueyed/rbenv,ffdc-scm/rbenv-x86_64-linux,yyyc514/rbenv,jmatbastos/rbenv,viclim/rbenv,rridhan/rbenv,codesdk/rbenv