Downgrade deps, breaking prod. Update README.md

[wilsonge]

Also fixes #293

Since typescript 2.4 the following errors occur:

[at-loader] ./lib/services/search.service.ts:195:24 
    TS2345: Argument of type 'Schema | Schema[]' is not assignable to parameter of type 'SwaggerSchema'.
  Type 'Schema[]' has no properties in common with type 'SwaggerSchema'. 

Downgrading to typescript 2.3.4 (the latest typescript 2.3.x series) fixes this.

On accessing the public page there were a variety of console errors that stemmed from zone 0.8.13 (angular/zone.js#832). Downgrading to 0.8.12 fixed this error (and seems to be recommended)

I've also updated the docs to suggest running the prod build before npm start as otherwise you got the error:

[at-loader] Checking finished with 3 errors
[at-loader] ./lib/bootstrap.ts:2:36 
    TS2307: Cannot find module '../compiled/lib/app.module.ngfactory'. 

Because the compiled directory hadn't been created yet.

[wilsonge]

@RomanGotsiy so with your latest commit this afternoon, things seem to work as per the README. On running npm start I do get:

[at-loader] Checking finished with 1 errors
[at-loader] ./lib/bootstrap.ts:2:36 
    TS2307: Cannot find module '../compiled/lib/app.module.ngfactory'. 

(although it doesn't seem to interupt display of the page)

[RomanHotsiy]

@wilsonge awesome!

Cannot find module '../compiled/lib/app.module.ngfactory'.
Yes, this message is OK. I will try to get rid of this as it may confuse contributors!

Can I close this PR then?