Add tests for unexpected end of input

[cesine]

Add tests to see if this error in dativebase/dative#324

Running "eco:files" (eco) task
...
File .tmp/scripts/templates/application-settings-view.js created.
>> Error in app/scripts/templates/application-settings.eco:
>> [stdin]:4:24: error: unexpected end of input
>>     _print _safe '\n' +

• is reproducible in 1.0.3 https://travis-ci.org/github/cesine/eco/jobs/710769130

test_compile
(node:5342) [DEP0025] DeprecationWarning: sys is deprecated. Use util instead.
✔ compiling fixtures/hello.eco
✖ compiling fixtures/end_of_input.eco
[stdin]:13:24: error: unexpected end of input
    _print _safe '\n' +
                       
✔ compiling fixtures/projects.eco
✔ compiling fixtures/helpers.eco
✔ parse error throws exception

• but not reproducible in master https://travis-ci.org/github/cesine/eco/jobs/710102116

test_compiler
✔ compiling fixtures/hello.eco
✔ compiling fixtures/end_of_input.eco
✔ compiling fixtures/projects.eco
✔ compiling fixtures/helpers.eco
✔ parse error throws exception