added writeToJsonMap and mergeFromJsonMap to reservedNames

The 0.3.6 version of the dart-protobuf library added two new functions, so this release changes the protobuf compiler to avoid using them.

0.3.5

Protobuf changes for smaller dart2js code, Int64 fixes

This change is paired with https://chromiumcodereview.appspot.com/814213003

Reduces code size for one app by 0.9%

1. Allow constants for the default value to avoid many trivial closures.
2. Generate and use static M.create() and M.createRepeated() methods on message classes M to ensure there is a shared copy of these closures rather than one copy per use.
3. Parse Int64 values rather than generate from 'int' to ensure no truncation errors in JavaScript.

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Review URL: https://chromiumcodereview.appspot.com//813373003

0.3.4

Parameterize uri resolution and parsing of options, use package:path.

This helps make the compiler more configurable
to embed it in other systems (like pub transformers)

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Review URL: https://chromiumcodereview.appspot.com//269823003

0.3.3

Update the version number

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Review URL: https://chromiumcodereview.appspot.com//212163003