Add code to generate build info code (in build.rs)

[TheWaWaR]

What're this PR do?

• Support get build info (used in build.rs, with an ASCII logo of Cryptape)
• Remove target/debug/deps cache from travis CI (reduce at least 10 minutes build time)

A Demo Project

https://github.com/TheWaWaR/build-info

Demo

$> program -V
program v0.1-2-gc4a2391-dev


$> program --version
program v0.1-2-gc4a2391-dev
(rustc 1.24.0-nightly-2017-12-04)

                       ..-nnmmmmnn-..
                  .-nndNNNNNNmddddmmmho.
                .smNNMMMNnn-         :nnmhn.
              .dNMMMMMNs--:nosnno-.     ..dNn..   ....
            .hNMMMMMMMNmmNNNMMMMMNmn     ..nMNNmmmmmmmmdnn.
           .mMMMMMMMMMMMMMMMMMMMMMMN:  ..ohmNNNNNNmdhnsoonms
          nNMMMMMMMMMMMMMMMMMMMMMMMMh.                 .-:dN:
         :NMMMMMMMMMMMMMMMMMMMMMMMMMNdnnnhhddmmmNNNNNNNNNNNMn
        .mMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMNNMMMMMMMMMMMMm dMN:
        nNMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMN sMMMMMMMNNNNNNdNMNn
       .dMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMNNMMMMMNdn.--nohmNMmo.
       nNMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMNmhnn       .:smNmhn.
       .NMMMMMMMMMMMMMMMMMMMMMMMMMMMNmhhdddhsnn.             nmMNmn:
       nMMMMMMMMMMMMMMMMMMMMMMMMMMMMh..              .:n:-.   oNddNNn
       oMMMMMMMMMMMMMMMMMMMMMMMMMMMMh.             .:noshmdnndmn  -hm.
       sMMMMMMMMMMMMMMMMMMMMMMMMMMMMNdsn-... .:.         -onsn:    .Nn
       hMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMNNmmdmmNn                osssNn
      .mMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMs   .nnnmNNmdhnnnnssonNn
      oNMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMNsnsdNMMMMMMNhssnhdo.Ns
     nmMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMNnoN.
    .nNMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMNdm
   oNMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMmn
  :NMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMNNdnNMNn
 .mMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMNNds:" nMMNn
 nMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMd:.    nMMMNo.
nNMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMNdo:...sMMMMNo
nNMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMNNmmNMMMMMm
 NMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMd
  :mNNNMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMNNNms
     mMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMm
   ._____. ._____.  _. ._   ._____. ._____.   ._.   ._____. ._____.
   | .___| |___. | | | | |  |___. | |_____|   |_|   |___. | |_____|
   | |     ._. | | | |_| |  ._. | |   ._.   ._____. ._. | | ._____.
   | |     | | |_| \_____/  | | |_/   | |   | ,_, | | | |_/ |_____|
   | |___. | | ._.   ._.    | |       | |   | | | | | |     ._____.
   |_____| |_| |_|   |_|    |_|       |_|   |_| |_| |_|     |_____|

[TheWaWaR]

@zhangsoledad Fixed

[codecov-io]

Codecov Report

Merging #53 into develop will decrease coverage by 0.12%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           develop     #53      +/-   ##
==========================================
- Coverage    43.22%   43.1%   -0.13%     
==========================================
  Files          129     130       +1     
  Lines        22037   22101      +64     
==========================================
  Hits          9526    9526              
- Misses       12511   12575      +64

Impacted Files	Coverage Δ
util/src/lib.rs	100% <ø> (ø)	⬆️
util/src/build_info.rs	0% <0%> (ø)

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