Notification users incase of error/warning/info for http requests

[harunurhan]

I think it's good to show user a little bit of information when we the record loading or tickets etc and also notify them if any request is failed.

When

• record is loading: Record is loading...
• tickets are loading: Tickets are loading...
• record failed: Couldn't load the record!
• tickets failed: Couldn't load the tickets!
• tickets no permission: Logged in user can not access to tickets
• extracting references: Extreacting references...
• references extracted: N references are extracted successfully

v2

(after #192 is merged)

• reverting: Reverting record to revision: <date>
• reverting done: Record is to revision: <date>, now you can edit

(Please add more or remove if you have something in mind @StellaCh @jmartinm )

UI

We could use https://github.com/scttcper/ngx-toastr for toast notifications

[jmartinm]

Also when getting the record and saving the record, GET and PUT requests it might happen that the user does not have permissions. We can show a message for that.

After extracting references it might also be good to show 'Extracting references...'

[StellaCh]

Yes, DESY also requested an 'Extracting References' message. Could be with a spinner.

A similar message 'Record is locked by user XXX' should be shown when someone tries to access the record but it is locked by someone else, see https://github.com/inspirehep/record-editor/issues/110

[harunurhan]

updated the list, @jmartinm @StellaCh

[StellaCh]

reverting: Reverting record to revision:

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