2.0.0-beta1

Changes:

• Cleanup project, re-target frameworks to netstandard2.0; netstandard1.4 ; net45
• Added the Dictionary and Raw query string abilities to IsAuthenticProxyRequest.
• Unittests for Proxy Authorization (skip - not finish yet).
• In PrepareQuerystring method, use StringComparer.Ordinal for query ordering to support uppercase querysting parameters.
• Refactor RequestEngine and AuthorizationService to use IHttpClientFactory
• Move JSON serialization settings and methods to static Serialization class.
• Remove redundant code in RequestExecutionPolicy (httpclient param).
• Fallback to LimitRetryExecutionPolicy if DefaultRequestExecutionPolicy. Default is set to null.
• Return path ASAP if queryParams don't contain anything
• Refactor HttpClient using.
• Refactor to reduce dependencies.
• Add build script, change version, Nuget status, more xml documents and README documents.
• Clean code.

Bugfix:

• Ignore case when looking for X-StoreId header.
• Change IsValidShopDomainAsync to make request to the root domain and not follow redirects.
• Change JSON Parsing to not lose time zone information when de-serializing JTokens.
• Use response.Content.Headers to check content type.
• Use wrong request parameters (option instead of optionDictionary).