Conversation come back

[RamyAlshurafa]

Relates #37

• show Today's conversation when visit Chat page.
• store the context for the last conversation.
• send the context along with the messages to Dialogflow to trigger the last intent.
• when the user visits the chat page for the first time and fills the basic info the app will start the daily conversation. (weekday, weekend, ....).
• fix some bugs.

[codecov[bot]]

Codecov Report

Merging #131 into master will decrease coverage by 1.19%. The diff coverage is 71.01%.

@@            Coverage Diff            @@
##           master     #131     +/-   ##
=========================================
- Coverage   84.67%   83.47%   -1.2%     
=========================================
  Files          50       61     +11     
  Lines         411      472     +61     
  Branches       20       24      +4     
=========================================
+ Hits          348      394     +46     
- Misses         57       70     +13     
- Partials        6        8      +2

Impacted Files	Coverage Δ
server/database/models/User.js	100% <ø> (ø)	:arrow_up:
server/database/queries/storeParams.js	100% <ø> (ø)	:arrow_up:
server/database/queries/makeDaysArray.js	100% <ø> (ø)	:arrow_up:
server/database/dummy_data/user.js	100% <ø> (ø)	:arrow_up:
server/database/queries/getUserDetails.js	50% <0%> (ø)	:arrow_up:
server/database/queries/get_last_event.js	0% <0%> (ø)
server/database/queries/update_last_event.js	0% <0%> (ø)
server/database/queries/get_context.js	100% <100%> (ø)
server/database/dummy_data/event_intents.js	100% <100%> (ø)
server/database/queries/set_context.js	100% <100%> (ø)
... and 22 more

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