Local DB support

Environment info

• OS: Windows 7
• App Version (Command/Ctrl + ,): Latest version

Description of the problem / feature request / question:

i created gist in lepton and it give me error gist creation failed because network was done

the gist was completely lost so i think it will be good in case of network down when gist creation is failed , it should save locally gist and when network is ok on sync it should create locally saved gists on github . Also it will be good if it maintain one local db for gists ,

[schoidev]

@hackjutsu OK. I will make this feature~

[rawrmonstar]

@Mesod using something like https://github.com/rt2zz/redux-persist with https://github.com/psperber/redux-persist-electron-storage should help a lot.