Update *express* and *winston* dependencies

[pdehaan]

Currently I'm getting an npm warning and notifications that a few modules are outdated and potentially vulnerable...

Steps to reproduce:

$ git clone https://github.com/digitarald/firewatch.git .

$ npm install
npm WARN package.json firewatch@1.0.1 No repository field.
npm WARN engine hawk@0.10.2: wanted: {"node":"0.8.x"} (current: {"node":"0.10.30","npm":"1.4.28"})
npm WARN engine boom@0.3.8: wanted: {"node":"0.8.x"} (current: {"node":"0.10.30","npm":"1.4.28"})
npm WARN engine cryptiles@0.1.3: wanted: {"node":"0.8.x"} (current: {"node":"0.10.30","npm":"1.4.28"})
npm WARN engine sntp@0.1.4: wanted: {"node":"0.8.x"} (current: {"node":"0.10.30","npm":"1.4.28"})
npm WARN engine hoek@0.7.6: wanted: {"node":"0.8.x"} (current: {"node":"0.10.30","npm":"1.4.28"})

$ npm shrinkwrap --dev
wrote npm-shrinkwrap.json

$ # sudo npm i nsp -g
$ nsp audit-shrinkwrap
Name  Installed   Patched  Vulnerable Dependency
qs      0.6.6     >= 1.x   firewatch > express > connect
qs      0.6.6     >= 1.x   firewatch > express > connect
send    0.1.4    >= 0.8.4  firewatch > express
qs      0.5.6     >= 1.x   firewatch > winston > request
qs      0.5.6     >= 1.x   firewatch > winston > request

$ npm outdated --depth 0
Package                Current  Wanted  Latest  Location
browserify-middleware    2.5.0   2.5.0   3.0.1  browserify-middleware
express                  3.4.8   3.4.8   4.9.4  express
mocha                   1.18.2  1.18.2  1.21.4  mocha
nomnom                   1.6.2   1.6.2   1.8.0  nomnom
opener                   1.3.0   1.3.0   1.4.0  opener
reactify                0.10.0  0.10.0  0.14.0  reactify
should                   3.2.0   3.2.0   4.0.4  should
socket.io               0.9.17  0.9.17   1.1.0  socket.io
stylus                  0.45.1  0.45.1  0.48.1  stylus
temp                     0.7.0   0.7.0   0.8.1  temp
winston                  0.7.3   0.7.3   0.8.0  winston

# .travis.yml not found

$ # sudo npm i pjv -g
$ pjv -wr
{ valid: true,
  warnings:
   [ 'Missing recommended field: bugs',
     'Missing recommended field: contributors',
     'Missing recommended field: repository' ],
  recommendations:
   [ 'Missing optional field: homepage',
     'Missing optional field: engines' ] }