FileUpload Component

[JonatanSalas]

This PR adds the FileUpload feature #2. There are some things that needs to be done to get at 100% but actually this working well.

I keep it open since I have finished to add:

• Modal to confirm delete on file
• Consume status from service and show an alert or success message when uploading files

Then I will add the following things:

• Avoid duplicated files
• Modal to confirm delete on file
• Provide a better way to customize styles
• Extract styles from JS or use somethings like CSS in JS option
• Consume status from service and show an alert or success message when uploading files
• Auto upload behaviour (This will delete the upload button that we use now, this could be another component too)

[coveralls]

Coverage decreased (-4.2%) to 25.532% when pulling dbb2b7b on experimental into a1f89bc on master.

[codecov-io]

Current coverage is 23.82% (diff: 11.85%)

Merging #27 into master will decrease coverage by 4.28%

@@             master        #27   diff @@
==========================================
  Files            24         28     +4   
  Lines           377        512   +135   
  Methods          48         72    +24   
  Messages          0          0          
  Branches         61         85    +24   
==========================================
+ Hits            106        122    +16   
- Misses          271        390   +119   
  Partials          0          0          

Powered by Codecov. Last update a1f89bc...b2a9d18

[coveralls]

Coverage decreased (-4.5%) to 25.21% when pulling 81e0c2b on experimental into a1f89bc on master.

[coveralls]

Coverage decreased (-4.7%) to 25.0% when pulling 55637ea on experimental into a1f89bc on master.

[coveralls]

Coverage decreased (-4.6%) to 25.105% when pulling 55637ea on experimental into a1f89bc on master.

[coveralls]

Coverage decreased (-4.6%) to 25.105% when pulling 55637ea on experimental into a1f89bc on master.

[coveralls]

Coverage decreased (-4.6%) to 25.105% when pulling b2a9d18 on experimental into a1f89bc on master.

[coveralls]

Coverage decreased (-4.6%) to 25.105% when pulling 98f8533 on experimental into a1f89bc on master.