Improve rendering of the tree

[Licenser]

Just because we can ;), the last element in a sub tree terminates with ` instead of |.

In addition the | is not drawn any longer on a level when there is no net element on that level to be show. (see ddb_client-0.1.11 in the example.

|- folsom_ddb-0.1.15 (hex package)
|  `- ddb_client-0.1.11 (hex package)
|     |- dproto-0.1.9 (hex package)
|     `- mmath-0.1.7 (hex package)
|- jsx-1.4.5 (hex package)

would have been drawn as:

|- folsom_ddb-0.1.15 (hex package)
|  `- ddb_client-0.1.11 (hex package)
|  |  |- dproto-0.1.9 (hex package)
|  |  `- mmath-0.1.7 (hex package)
|- jsx-1.4.5 (hex package)

Full output:

|- bcrypt-0.0.0+build.89.ref464e423 (git repo)
|- bitcask-1.7.0 (git repo)
|  `- otp_compat-1.0.0 (git repo)
|- clique-0.0.0+build.140.ref8067df5 (git repo)
|- cuttlefish-0.0.0+build.479.reff5f6fdc (git repo)
|  |- getopt-0.4.3 (git repo)
|  `- neotoma-0.0.0+build.125.ref760928e (git repo)
|- edown-0.2.4+build.100.ref8d7e7ca (git repo)
|- eper-0.93.0 (hex package)
|- esqlite-0.1.0 (git repo)
|- fifo_db-0.1.7 (git repo)
|  `- eleveldb-0.0.0+build.494.refa36dbd6 (git repo)
|- fifo_dt-0.1.51 (git repo)
|  `- riak_dt-0.0.0+build.307.reff7981d4 (git repo)
|- fifo_spec-0.1.19 (git repo)
|- fifo_utils-0.1.12 (git repo)
|- folsom_ddb-0.1.15 (hex package)
|  `- ddb_client-0.1.11 (hex package)
|     |- dproto-0.1.9 (hex package)
|     `- mmath-0.1.7 (hex package)
|- jsx-1.4.5 (hex package)
|- jsxd-0.1.10 (git repo)
|- lager-3.0.1 (git repo)
|  `- goldrush-0.1.7 (git repo)
|- lager_watchdog-0.1.10 (git repo)
|- libsnarlmatch-0.1.6 (git repo)
|- mdns_server_lib-0.1.19 (git repo)
|  |- mdns_server-0.1.1 (hex package)
|  `- ranch-1.1.0 (hex package)
|- meck-0.8.2 (git repo)
|- merklet-1.0.0 (git repo)
|- oauth2-0.6.0 (git repo)
|- rankmatcher-0.1.2 (git repo)
|- recon-2.2.0 (hex package)
|- riak_core-git (git repo)
|  |- basho_stats-1.0.3 (git repo)
|  |- chash-0.1.1 (git repo)
|  |- exometer_core-0.0.0+build.19.refb47a5d6 (git repo)
|  |  |- folsom-0.0.0+build.292.ref7294452 (git repo)
|  |  |  `- bear-0.0.0+build.11.refda820a1 (git repo)
|  |  |- parse_trans-0.0.0+build.106.ref82cc002 (git repo)
|  |  `- setup-0.0.0+build.79.ref51ee7c9 (git repo)
|  |- pbkdf2-0.0.0+build.2676.ref7076584 (git repo)
|  |- poolboy-0.0.0+build.124.ref8bb45fb (git repo)
|  `- riak_sysmon-2.0.0 (git repo)
|- riak_ensemble-0.0.0+build.154.ref2f6eb9c (git repo)
|- snarl-0.6.2 (project app)
|- snarl_oauth-0.1.0 (project app)
|- uuid-0.4.7 (git repo)
`- yubico-0.1.3 (git repo)

[tsloughter]

You'll need to rebase this, the PR is full of merges :). Also, maybe there is a better character we can use? Like the tree command uses in linux.

[tsloughter]

Some examples of options for this http://unix.stackexchange.com/questions/127063/tree-command-output-with-pure-7-bit-ascii-output

[Licenser]

UTF8:

└─ rebar─3.0.0-beta-2 (project app)
   ├─ bbmustache─1.0.4 (hex package)
   ├─ erlware_commons─0.15.0 (hex package)
   ├─ getopt─0.8.2 (hex package)
   ├─ providers─1.4.1 (hex package)
   ├─ relx─3.5.0 (hex package)
   └─ ssl_verify_hostname─1.0.5 (hex package)

[Licenser]

closed for #766 as a clean state